diff --git a/tlsf_block_functions.h b/tlsf_block_functions.h
index d801442..ff766c7 100644
--- a/tlsf_block_functions.h
+++ b/tlsf_block_functions.h
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include <assert.h>
+
 #if defined(__cplusplus)
 extern "C" {
 #endif