diff --git a/include/assert.h b/include/assert.h
index 0d4393f30c824..cac7cb3a241f5 100644
--- a/include/assert.h
+++ b/include/assert.h
@@ -30,6 +30,7 @@
  ****************************************************************************/
 
 #include <nuttx/compiler.h>
+#include <sys/types.h>
 
 /****************************************************************************
  * Pre-processor Definitions