diff --git a/plat/st/stm32mp1/platform.mk b/plat/st/stm32mp1/platform.mk
index 2a4ab78..8d1602d 100644
--- a/plat/st/stm32mp1/platform.mk
+++ b/plat/st/stm32mp1/platform.mk
@@ -28,6 +28,8 @@
 TF_CFLAGS		+=	-mfloat-abi=soft
 endif
 
+TF_CFLAGS		+=	-Wsign-compare
+
 # Not needed for Cortex-A7
 WORKAROUND_CVE_2017_5715:=	0