diff --git a/client/Makefile b/client/Makefile
index 03e77ed4..256e3719 100644
--- a/client/Makefile
+++ b/client/Makefile
@@ -5,6 +5,7 @@ LDFLAGS = -lrt
 CFLAGS  += -ffast-math
 CFLAGS  += -fdata-sections -ffunction-sections
 LDFLAGS += -Wl,--gc-sections
+CFLAGS  += -Wfatal-errors
 
 LIBS    = sdl2 SDL2_ttf gl glu libssl openssl spice-protocol fontconfig x11 libconfig libva libva-glx
 CFLAGS  += $(shell pkg-config --cflags $(LIBS))