diff --git a/engine/client/client.h b/engine/client/client.h
index fc4f9a9c..c726b1c9 100644
--- a/engine/client/client.h
+++ b/engine/client/client.h
@@ -33,6 +33,7 @@ GNU General Public License for more details.
 #include "net_api.h"
 #include "world.h"
 #include "ref_common.h"
+#include "voice.h"
 
 // client sprite types
 #define SPR_CLIENT		0	// client sprite for temp-entities or user-textures