diff --git a/src/basic/hashmap.c b/src/basic/hashmap.c
index b3954e3223..286ddfef5b 100644
--- a/src/basic/hashmap.c
+++ b/src/basic/hashmap.c
@@ -37,6 +37,7 @@
 #include "util.h"
 
 #ifdef ENABLE_DEBUG_HASHMAP
+#include <pthread.h>
 #include "list.h"
 #endif