diff --git a/src/FACT.c b/src/FACT.c
index 6cab507fb..8b2cd26ba 100644
--- a/src/FACT.c
+++ b/src/FACT.c
@@ -290,6 +290,7 @@ uint32_t FACTAudioEngine_Initialize(
 			NULL
 		) != 0) {
 			FAudio_Release(pEngine->audio);
+			FAudio_PlatformUnlockMutex(pEngine->apiLock);
 			return FAUDIO_E_INVALID_CALL;
 		}
 	}