diff --git a/porting/nimble/include/os/os.h b/porting/nimble/include/os/os.h
index 6dc304b7a..40fc267d3 100644
--- a/porting/nimble/include/os/os.h
+++ b/porting/nimble/include/os/os.h
@@ -20,6 +20,8 @@
 #ifndef _OS_H
 #define _OS_H
 
+#include <assert.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif