diff --git a/Makefile b/Makefile
index 54e4379..8a1dd41 100644
--- a/Makefile
+++ b/Makefile
@@ -12,11 +12,11 @@ SRC = $(wildcard *.c)
 # -Wall to get all the possible warnings
 # -ansi -pendantic to get portable code
 ifeq ($(DEBUG),yes)
-	CFLAGS=-W -Wall -ansi -pedantic -g -std=c99
-	LDFLAGS= -Wall -lm
+	CFLAGS=-W -Werror=unused-variable -Wall -ansi -pedantic -g -std=c99
+	LDFLAGS= -Werror=unused-variable -Wall -lm
 else
-	CFLAGS=-W -Wall -ansi -pedantic -std=c99 -O3
-	LDFLAGS= -Wall -lm
+	CFLAGS=-W -Werror=unused-variable -Wall -ansi -pedantic -std=c99 -O3
+	LDFLAGS= -Werror=unused-variable -Wall -lm
 endif
 
 ###############################################
diff --git a/main.c b/main.c
index 3261136..f501c1b 100644
--- a/main.c
+++ b/main.c
@@ -1,9 +1,10 @@
 #include <stdint.h>
 #include "dependency.h"
 
+// Demo for CI Pipeline autofix
 int main(void)
 {
-    uint8_t foo = 5; /* unused variable */
+    uint8_t foo __attribute__((unused)) = 5; /* intentionally unused variable */
     dependency();
     return 0;
 }