diff --git a/tests/include/test/helpers.h b/tests/include/test/helpers.h
index aa03701..c3a844b 100644
--- a/tests/include/test/helpers.h
+++ b/tests/include/test/helpers.h
@@ -31,6 +31,11 @@
 #include MBEDTLS_CONFIG_FILE
 #endif
 
+#if defined(MBEDTLS_THREADING_C) && defined(MBEDTLS_THREADING_PTHREAD) && \
+    defined(MBEDTLS_TEST_HOOKS)
+#define MBEDTLS_TEST_MUTEX_USAGE
+#endif
+
 #if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
@@ -63,6 +68,9 @@
     const char *filename;
     int line_no;
     unsigned long step;
+#if defined(MBEDTLS_TEST_MUTEX_USAGE)
+    const char *mutex_usage_error;
+#endif
 }
 mbedtls_test_info_t;
 extern mbedtls_test_info_t mbedtls_test_info;
@@ -260,13 +268,14 @@
 #include "test/fake_external_rng_for_test.h"
 #endif
 
-#if defined(MBEDTLS_THREADING_C) && defined(MBEDTLS_THREADING_PTHREAD) && \
-    defined(MBEDTLS_TEST_HOOKS)
-#define MBEDTLS_TEST_MUTEX_USAGE
-
+#if defined(MBEDTLS_TEST_MUTEX_USAGE)
 /** Permanently activate the mutex usage verification framework. See
  * threading_helpers.c for information. */
 void mbedtls_test_mutex_usage_init( void );
+
+/** Call this function after executing a test case to check for mutex usage
+ * errors. */
+void mbedtls_test_mutex_usage_check( void );
 #endif /* MBEDTLS_TEST_MUTEX_USAGE */
 
 #endif /* TEST_HELPERS_H */