diff --git a/Makefile b/Makefile
index 6e0f2eb6..ba1b6fc9 100644
--- a/Makefile
+++ b/Makefile
@@ -197,7 +197,6 @@ ifneq ($(BUILD_CLIENT),0)
     CURL_LIBS=$(shell pkg-config --silence-errors --libs libcurl)
     OPENAL_CFLAGS=$(shell pkg-config --silence-errors --cflags openal)
     OPENAL_LIBS=$(shell pkg-config --silence-errors --libs openal)
-    # FIXME: introduce CLIENT_CFLAGS
     SDL_CFLAGS=$(shell pkg-config --silence-errors --cflags sdl|sed 's/-Dmain=SDL_main//')
     SDL_LIBS=$(shell pkg-config --silence-errors --libs sdl)
   endif
@@ -869,6 +868,7 @@ endif
 
 ifeq ($(USE_VOIP),1)
   CLIENT_CFLAGS += -DUSE_VOIP
+  SERVER_CFLAGS += -DUSE_VOIP
   ifeq ($(USE_INTERNAL_SPEEX),1)
     CLIENT_CFLAGS += -DFLOATING_POINT -DUSE_ALLOCA -I$(SPEEXDIR)/include
   else