diff --git a/tests/include/test/psa_crypto_helpers.h b/tests/include/test/psa_crypto_helpers.h
index d50bc68..15ffffb 100644
--- a/tests/include/test/psa_crypto_helpers.h
+++ b/tests/include/test/psa_crypto_helpers.h
@@ -227,6 +227,22 @@
  * Provide implementations of these functions for testing. */
 int mbedtls_test_inject_entropy_seed_read(unsigned char *buf, size_t len);
 int mbedtls_test_inject_entropy_seed_write(unsigned char *buf, size_t len);
+
+
+/** Make sure that the injected entropy is present.
+ *
+ * When MBEDTLS_PSA_INJECT_ENTROPY is enabled, psa_crypto_init()
+ * will fail if the PSA entropy seed is not present.
+ * This function must be called at least once in a test suite or other
+ * program before any call to psa_crypto_init().
+ * It does not need to be called in each test case.
+ *
+ * The test framework calls this function before running any test case.
+ *
+ * The few tests that might remove the entropy file must call this function
+ * in their cleanup.
+ */
+int mbedtls_test_inject_entropy_restore(void);
 #endif /* MBEDTLS_PSA_INJECT_ENTROPY */
 
 
diff --git a/tests/src/helpers.c b/tests/src/helpers.c
index 30fd362..7cac6e0 100644
--- a/tests/src/helpers.c
+++ b/tests/src/helpers.c
@@ -20,6 +20,11 @@
 #include <test/macros.h>
 #include <string.h>
 
+#if defined(MBEDTLS_PSA_INJECT_ENTROPY)
+#include <psa/crypto.h>
+#include <test/psa_crypto_helpers.h>
+#endif
+
 /*----------------------------------------------------------------------------*/
 /* Static global variables */
 
@@ -35,9 +40,22 @@
 int mbedtls_test_platform_setup(void)
 {
     int ret = 0;
+
+#if defined(MBEDTLS_PSA_INJECT_ENTROPY)
+    /* Make sure that injected entropy is present. Otherwise
+     * psa_crypto_init() will fail. This is not necessary for test suites
+     * that don't use PSA, but it's harmless (except for leaving a file
+     * behind). */
+    ret = mbedtls_test_inject_entropy_restore();
+    if (ret != 0) {
+        return ret;
+    }
+#endif
+
 #if defined(MBEDTLS_PLATFORM_C)
     ret = mbedtls_platform_setup(&platform_ctx);
 #endif /* MBEDTLS_PLATFORM_C */
+
     return ret;
 }
 
diff --git a/tests/src/psa_crypto_helpers.c b/tests/src/psa_crypto_helpers.c
index 7861185..cab96ab 100644
--- a/tests/src/psa_crypto_helpers.c
+++ b/tests/src/psa_crypto_helpers.c
@@ -178,6 +178,20 @@
     return 0;
 }
 
+int mbedtls_test_inject_entropy_restore(void)
+{
+    unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
+    for (size_t i = 0; i < sizeof(buf); i++) {
+        buf[i] = (unsigned char) i;
+    }
+    psa_status_t status = mbedtls_psa_inject_entropy(buf, sizeof(buf));
+    /* It's ok if the file was just created, or if it already exists. */
+    if (status != PSA_SUCCESS && status != PSA_ERROR_NOT_PERMITTED) {
+        return status;
+    }
+    return PSA_SUCCESS;
+}
+
 #endif /* MBEDTLS_PSA_INJECT_ENTROPY */
 
 #endif /* MBEDTLS_PSA_CRYPTO_C */
diff --git a/tests/suites/test_suite_psa_crypto_entropy.function b/tests/suites/test_suite_psa_crypto_entropy.function
index 1bb9efb..f751287 100644
--- a/tests/suites/test_suite_psa_crypto_entropy.function
+++ b/tests/suites/test_suite_psa_crypto_entropy.function
@@ -153,8 +153,8 @@
     TEST_ASSERT(memcmp(output, zeros, sizeof(output)) != 0);
 exit:
     mbedtls_free(seed);
-    remove_seed_file();
     PSA_DONE();
+    mbedtls_test_inject_entropy_restore();
 }
 /* END_CASE */
 
@@ -186,7 +186,7 @@
     status = mbedtls_psa_inject_entropy(seed, sizeof(seed));
     TEST_EQUAL(status, PSA_ERROR_NOT_PERMITTED);
 exit:
-    remove_seed_file();
     PSA_DONE();
+    mbedtls_test_inject_entropy_restore();
 }
 /* END_CASE */