diff --git a/src/add-ons/accelerants/common/validate_display_mode.cpp b/src/add-ons/accelerants/common/validate_display_mode.cpp
index 11863ffa34..645660dade 100644
--- a/src/add-ons/accelerants/common/validate_display_mode.cpp
+++ b/src/add-ons/accelerants/common/validate_display_mode.cpp
@@ -6,6 +6,8 @@
 
 #include <validate_display_mode.h>
 
+#include <string.h>
+
 
 static uint16
 round(uint16 value, uint16 resolution)