diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index 6ee3d6c..c23ff2c 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -5299,39 +5299,6 @@
           MBEDTLS_ECP_DP_SECP256R1_ENABLED ||
           MBEDTLS_ECP_DP_SECP384R1_ENABLED */
 
-#if defined(MBEDTLS_TEST_HOOKS) && defined(MBEDTLS_ECP_C)
-MBEDTLS_STATIC_TESTABLE
-void mbedtls_ecp_fix_negative(mbedtls_mpi *N, signed char c, size_t bits)
-{
-    size_t i;
-
-    /* Set N := 2^bits - 1 - N. We know that 0 <= N < 2^bits, so
-     * set the absolute value to 0xfff...fff - N. There is no carry
-     * since we're subtracting from all-bits-one.  */
-    for (i = 0; i <= bits / 8 / sizeof(mbedtls_mpi_uint); i++) {
-        N->p[i] = ~(mbedtls_mpi_uint) 0 - N->p[i];
-    }
-    /* Add 1, taking care of the carry. */
-    i = 0;
-    do {
-        ++N->p[i];
-    } while (N->p[i++] == 0 && i <= bits / 8 / sizeof(mbedtls_mpi_uint));
-    /* Invert the sign.
-     * Now N = N0 - 2^bits where N0 is the initial value of N. */
-    N->s = -1;
-
-    /* Add |c| * 2^bits to the absolute value. Since c and N are
-     * negative, this adds c * 2^bits. */
-    mbedtls_mpi_uint msw = (mbedtls_mpi_uint) -c;
-#if defined(MBEDTLS_HAVE_INT64)
-    if (bits == 224) {
-        msw <<= 32;
-    }
-#endif
-    N->p[bits / 8 / sizeof(mbedtls_mpi_uint)] += msw;
-}
-#endif /* MBEDTLS_TEST_HOOKS & MBEDTLS_ECP_C */
-
 #if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
 /* Size of p521 in terms of mbedtls_mpi_uint */
 #define P521_WIDTH      (521 / 8 / sizeof(mbedtls_mpi_uint) + 1)
diff --git a/library/ecp_invasive.h b/library/ecp_invasive.h
index 05522b6..8b8ac8a 100644
--- a/library/ecp_invasive.h
+++ b/library/ecp_invasive.h
@@ -33,19 +33,6 @@
 
 #if defined(MBEDTLS_TEST_HOOKS) && defined(MBEDTLS_ECP_C)
 
-#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
-/* Preconditions:
- *   - bits is a multiple of 64 or is 224
- *   - c is -1 or -2
- *   - 0 <= N < 2^bits
- *   - N has room for bits plus one limb
- *
- * Behavior:
- * Set N to c * 2^bits + old_value_of_N.
- */
-void mbedtls_ecp_fix_negative(mbedtls_mpi *N, signed char c, size_t bits);
-#endif
-
 #if defined(MBEDTLS_ECP_MONTGOMERY_ENABLED)
 /** Generate a private key on a Montgomery curve (Curve25519 or Curve448).
  *
diff --git a/tests/suites/test_suite_ecp.data b/tests/suites/test_suite_ecp.data
index 3fbad92..1f6dfc1 100644
--- a/tests/suites/test_suite_ecp.data
+++ b/tests/suites/test_suite_ecp.data
@@ -855,130 +855,6 @@
 depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
 ecp_muladd_restart:MBEDTLS_ECP_DP_SECP256R1:"CB28E0999B9C7715FD0A80D8E47A77079716CBBF917DD72E97566EA1C066957C":"2B57C0235FB7489768D058FF4911C20FDBE71E3699D91339AFBB903EE17255DC":"C3875E57C85038A0D60370A87505200DC8317C8C534948BEA6559C7C18E6D4CE":"3B4E49C4FDBFC006FF993C81A50EAE221149076D6EC09DDD9FB3B787F85B6483":"2442A5CC0ECD015FA3CA31DC8E2BBC70BF42D60CBCA20085E0822CB04235E970":"6FC98BD7E50211A4A27102FA3549DF79EBCB4BF246B80945CDDFE7D509BBFD7D":250:4:64
 
-ECP fix_negative: 0, -1, 224
-fix_negative:"00":-1:224
-
-ECP fix_negative: 1, -1, 224
-fix_negative:"01":-1:224
-
-ECP fix_negative: 2^32-1, -1, 224
-fix_negative:"ffffffff":-1:224
-
-ECP fix_negative: 2^32, -1, 224
-fix_negative:"0100000000":-1:224
-
-ECP fix_negative: 2^64-1, -1, 224
-fix_negative:"ffffffffffffffff":-1:224
-
-ECP fix_negative: 2^64, -1, 224
-fix_negative:"010000000000000000":-1:224
-
-ECP fix_negative: 2^128-1, -1, 224
-fix_negative:"ffffffffffffffffffffffffffffffff":-1:224
-
-ECP fix_negative: 2^128, -1, 224
-fix_negative:"0100000000000000000000000000000000":-1:224
-
-ECP fix_negative: 2^128+1, -1, 224
-fix_negative:"0100000000000000000000000000000001":-1:224
-
-ECP fix_negative: 2^224-1, -1, 224
-fix_negative:"ffffffffffffffffffffffffffffffffffffffffffffffffffffffff":-1:224
-
-ECP fix_negative: 0, -2, 224
-fix_negative:"00":-2:224
-
-ECP fix_negative: 1, -2, 224
-fix_negative:"01":-2:224
-
-ECP fix_negative: 2^32-1, -2, 224
-fix_negative:"ffffffff":-2:224
-
-ECP fix_negative: 2^32, -2, 224
-fix_negative:"0100000000":-2:224
-
-ECP fix_negative: 2^64-1, -2, 224
-fix_negative:"ffffffffffffffff":-2:224
-
-ECP fix_negative: 2^64, -2, 224
-fix_negative:"010000000000000000":-2:224
-
-ECP fix_negative: 2^128-1, -2, 224
-fix_negative:"ffffffffffffffffffffffffffffffff":-2:224
-
-ECP fix_negative: 2^128, -2, 224
-fix_negative:"0100000000000000000000000000000000":-2:224
-
-ECP fix_negative: 2^128+1, -2, 224
-fix_negative:"0100000000000000000000000000000001":-2:224
-
-ECP fix_negative: 2^224-1, -2, 224
-fix_negative:"ffffffffffffffffffffffffffffffffffffffffffffffffffffffff":-2:224
-
-ECP fix_negative: 0, -1, 256
-fix_negative:"00":-1:256
-
-ECP fix_negative: 1, -1, 256
-fix_negative:"01":-1:256
-
-ECP fix_negative: 2^32-1, -1, 256
-fix_negative:"ffffffff":-1:256
-
-ECP fix_negative: 2^32, -1, 256
-fix_negative:"0100000000":-1:256
-
-ECP fix_negative: 2^64-1, -1, 256
-fix_negative:"ffffffffffffffff":-1:256
-
-ECP fix_negative: 2^64, -1, 256
-fix_negative:"010000000000000000":-1:256
-
-ECP fix_negative: 2^128-1, -1, 256
-fix_negative:"ffffffffffffffffffffffffffffffff":-1:256
-
-ECP fix_negative: 2^128, -1, 256
-fix_negative:"0100000000000000000000000000000000":-1:256
-
-ECP fix_negative: 2^128+1, -1, 256
-fix_negative:"0100000000000000000000000000000001":-1:256
-
-ECP fix_negative: 2^256-1, -1, 256
-fix_negative:"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff":-1:256
-
-ECP fix_negative: 0, -2, 256
-fix_negative:"00":-2:256
-
-ECP fix_negative: 1, -2, 256
-fix_negative:"01":-2:256
-
-ECP fix_negative: 2^32-1, -2, 256
-fix_negative:"ffffffff":-2:256
-
-ECP fix_negative: 2^32, -2, 256
-fix_negative:"0100000000":-2:256
-
-ECP fix_negative: 2^64-1, -2, 256
-fix_negative:"ffffffffffffffff":-2:256
-
-ECP fix_negative: 2^64, -2, 256
-fix_negative:"010000000000000000":-2:256
-
-ECP fix_negative: 2^128-1, -2, 256
-fix_negative:"ffffffffffffffffffffffffffffffff":-2:256
-
-ECP fix_negative: 2^128, -2, 256
-fix_negative:"0100000000000000000000000000000000":-2:256
-
-ECP fix_negative: 2^128+1, -2, 256
-fix_negative:"0100000000000000000000000000000001":-2:256
-
-ECP fix_negative: 2^256-1, -2, 256
-fix_negative:"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff":-2:256
-
-# The first call to fix_negative in the test case of issue #4296.
-ECP fix_negative: #4296.1
-fix_negative:"8A4DD4C8B42C5EAED15FE4F4579F4CE513EC90A94010BF000000000000000000":-1:256
-
 ECP export key parameters #1 (OK)
 depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
 ecp_export:MBEDTLS_ECP_DP_SECP256R1:"37cc56d976091e5a723ec7592dff206eee7cf9069174d0ad14b5f76822596292":"4ee500d82311ffea2fd2345d5d16bd8a88c26b770d55cd8a2a0efa01c8b4edff":"00f12a1320760270a83cbffd53f6031ef76a5d86c8a204f2c30ca9ebf51f0f0ea7":0:0
diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index 78aca8a..32d5d8d 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -8,11 +8,6 @@
 #include "ecp_invasive.h"
 #include "bignum_mod_raw_invasive.h"
 
-#if defined(MBEDTLS_TEST_HOOKS) &&                  \
-    defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
-#define HAVE_FIX_NEGATIVE
-#endif
-
 #define ECP_PF_UNKNOWN     -1
 
 #define ECP_PT_RESET(x)           \
@@ -1091,36 +1086,6 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:HAVE_FIX_NEGATIVE */
-void fix_negative(data_t *N_bin, int c, int bits)
-{
-    mbedtls_mpi C, M, N;
-
-    mbedtls_mpi_init(&C);
-    mbedtls_mpi_init(&M);
-    mbedtls_mpi_init(&N);
-
-    /* C = - c * 2^bits (positive since c is negative) */
-    TEST_EQUAL(0, mbedtls_mpi_lset(&C, -c));
-    TEST_EQUAL(0, mbedtls_mpi_shift_l(&C, bits));
-
-    TEST_EQUAL(0, mbedtls_mpi_read_binary(&N, N_bin->x, N_bin->len));
-    TEST_EQUAL(0, mbedtls_mpi_grow(&N, C.n));
-
-    /* M = N - C = - ( C - N ) (expected result of fix_negative) */
-    TEST_EQUAL(0, mbedtls_mpi_sub_mpi(&M, &N, &C));
-
-    mbedtls_ecp_fix_negative(&N, c, bits);
-
-    TEST_EQUAL(0, mbedtls_mpi_cmp_mpi(&N, &M));
-
-exit:
-    mbedtls_mpi_free(&C);
-    mbedtls_mpi_free(&M);
-    mbedtls_mpi_free(&N);
-}
-/* END_CASE */
-
 /* BEGIN_CASE depends_on:MBEDTLS_TEST_HOOKS:MBEDTLS_ECP_MONTGOMERY_ENABLED */
 void genkey_mx_known_answer(int bits, data_t *seed, data_t *expected)
 {