diff --git a/library/threading.c b/library/threading.c
index fa4f6c9..95ae8d1 100644
--- a/library/threading.c
+++ b/library/threading.c
@@ -33,7 +33,7 @@
     (defined(__APPLE__) && defined(__MACH__)))
 #include <unistd.h>
 #if !defined(_POSIX_VERSION)
-#define MBEDTLS_THREADING_USE_GMTIME
+#define THREADING_USE_GMTIME
 #endif /* !_POSIX_VERSION */
 #endif /* !_WIN32 && (__unix__ || (__APPLE__ && __MACH__)) */
 
@@ -122,7 +122,7 @@
 #if defined(MBEDTLS_FS_IO)
     mbedtls_mutex_init( &mbedtls_threading_readdir_mutex );
 #endif
-#if defined(MBEDTLS_THREADING_USE_GMTIME)
+#if defined(THREADING_USE_GMTIME)
     mbedtls_mutex_init( &mbedtls_threading_gmtime_mutex );
 #endif
 }
@@ -135,7 +135,7 @@
 #if defined(MBEDTLS_FS_IO)
     mbedtls_mutex_free( &mbedtls_threading_readdir_mutex );
 #endif
-#if defined(MBEDTLS_THREADING_USE_GMTIME)
+#if defined(THREADING_USE_GMTIME)
     mbedtls_mutex_free( &mbedtls_threading_gmtime_mutex );
 #endif
 }
@@ -150,7 +150,7 @@
 #if defined(MBEDTLS_FS_IO)
 mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;
 #endif
-#if defined(MBEDTLS_THREADING_USE_GMTIME)
+#if defined(THREADING_USE_GMTIME)
 mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex MUTEX_INIT;
 #endif