diff --git a/src/declarativeimports/core/windowthumbnail.cpp b/src/declarativeimports/core/windowthumbnail.cpp
index c07955bf1..d3130d505 100644
--- a/src/declarativeimports/core/windowthumbnail.cpp
+++ b/src/declarativeimports/core/windowthumbnail.cpp
@@ -43,6 +43,8 @@ typedef GLvoid(*glEGLImageTargetTexture2DOES_func)(GLenum, GLeglImageOES);
 #endif // HAVE_EGL
 #endif
 
+#include <cstdlib>
+
 namespace Plasma
 {