diff --git a/flight/AHRS/Makefile b/flight/AHRS/Makefile
index 8d1e06ac2..f0a07dacb 100644
--- a/flight/AHRS/Makefile
+++ b/flight/AHRS/Makefile
@@ -246,6 +246,7 @@ CFLAGS += -fpromote-loop-indices
 endif
 
 CFLAGS += -Wall
+CFLAGS += -Werror
 CFLAGS += -Wa,-adhlns=$(addprefix $(OUTDIR)/, $(notdir $(addsuffix .lst, $(basename $<))))
 # Compiler flags to generate dependency files:
 CFLAGS += -MD -MP -MF $(OUTDIR)/dep/$(@F).d