diff --git a/whisper.h b/whisper.h
index f462370a330..381afd71d6e 100644
--- a/whisper.h
+++ b/whisper.h
@@ -2,6 +2,7 @@
 #define WHISPER_H
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #ifdef WHISPER_SHARED
 #    ifdef _WIN32