assert cleanup.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/htsthread.c b/src/htsthread.c
index 364757b..143c22c 100644
--- a/src/htsthread.c
+++ b/src/htsthread.c
@@ -196,7 +196,7 @@ HTSEXT_API void hts_mutexlock(htsmutex * mutex) {
   }
   assertf(*mutex != NULL);
 #ifdef _WIN32
-  assert((*mutex)->handle != NULL);
+  assertf((*mutex)->handle != NULL);
   WaitForSingleObject((*mutex)->handle, INFINITE);
 #else
   pthread_mutex_lock(&(*mutex)->handle);
@@ -206,7 +206,7 @@ HTSEXT_API void hts_mutexlock(htsmutex * mutex) {
 HTSEXT_API void hts_mutexrelease(htsmutex * mutex) {
   assertf(mutex != NULL && *mutex != NULL);
 #ifdef _WIN32
-  assert((*mutex)->handle != NULL);
+  assertf((*mutex)->handle != NULL);
   ReleaseMutex((*mutex)->handle);
 #else
   pthread_mutex_unlock(&(*mutex)->handle);