diff --git a/Makefile b/Makefile
index 4b0190d2..a35e8da9 100644
--- a/Makefile
+++ b/Makefile
@@ -20,6 +20,10 @@ else
 	CC_FLAGS += -DMACHINE_$(MACHINE)
 endif
 
+ifeq ($(CI),1)
+	CC_FLAGS += --Werror
+endif
+
 BUILDDIR = output/$(MACHINE)
 VERSION_HEADER := version.h