diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 4a270a832a99..f1b25ff26155 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -22,6 +22,7 @@
  * which only defines FRONTEND besides including "c.h"
  */
 #include "c.h"
+#include "common/fe_memutils.h"
 
 #ifndef WIN32
 #include <poll.h>