diff --git a/tests/suites/test_suite_bignum.function b/tests/suites/test_suite_bignum.function
index 7c79ddb..4552f7f 100644
--- a/tests/suites/test_suite_bignum.function
+++ b/tests/suites/test_suite_bignum.function
@@ -391,7 +391,7 @@
         TEST_ASSERT(sign_is_valid(&X));
         TEST_ASSERT(mbedtls_mpi_write_string(&X, radix_A, str, output_size, &len) == result_write);
         if (result_write == 0) {
-            TEST_ASSERT(strcasecmp(str, input_A) == 0);
+            TEST_ASSERT(strcmp(str, input_A) == 0);
             TEST_ASSERT(str[len] == '!');
         }
     }
diff --git a/tests/suites/test_suite_bignum.misc.data b/tests/suites/test_suite_bignum.misc.data
index 211906c..e92f042 100644
--- a/tests/suites/test_suite_bignum.misc.data
+++ b/tests/suites/test_suite_bignum.misc.data
@@ -62,10 +62,10 @@
 mpi_read_write_string:16:"-23":17:"-23":4:0:MBEDTLS_ERR_MPI_BAD_INPUT_DATA
 
 Test mpi_read_write_string #6 (Output radix of 15)
-mpi_read_write_string:10:"29":15:"1e":100:0:0
+mpi_read_write_string:10:"29":15:"1E":100:0:0
 
 Test mpi_read_write_string #7
-mpi_read_write_string:10:"56125680981752282334141896320372489490613963693556392520816017892111350604111697682705498319512049040516698827829292076808006940873974979584527073481012636016353913462376755556720019831187364993587901952757307830896531678727717924":16:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":200:0:0
+mpi_read_write_string:10:"56125680981752282334141896320372489490613963693556392520816017892111350604111697682705498319512049040516698827829292076808006940873974979584527073481012636016353913462376755556720019831187364993587901952757307830896531678727717924":16:"0941379D00FED1491FE15DF284DFDE4A142F68AA8D412023195CEE66883E6290FFE703F4EA5963BF212713CEE46B107C09182B5EDCD955ADAC418BF4918E2889AF48E1099D513830CEC85C26AC1E158B52620E33BA8692F893EFBB2F958B4424":200:0:0
 
 Test mpi_read_write_string #8 (Empty MPI hex -> hex)
 mpi_read_write_string:16:"":16:"":4:0:0