diff --git a/Makefile b/Makefile
index e455635..52c0491 100644
--- a/Makefile
+++ b/Makefile
@@ -537,15 +537,15 @@
 endif
 
 ifeq (${ARCH},aarch64)
-BL1_CFLAGS += -DIMAGE_AT_EL3
+BL1_CPPFLAGS += -DIMAGE_AT_EL3
 ifeq ($(BL2_AT_EL3),1)
-BL2_CFLAGS += -DIMAGE_AT_EL3
+BL2_CPPFLAGS += -DIMAGE_AT_EL3
 else
-BL2_CFLAGS += -DIMAGE_AT_EL1
+BL2_CPPFLAGS += -DIMAGE_AT_EL1
 endif
-BL2U_CFLAGS += -DIMAGE_AT_EL1
-BL31_CFLAGS += -DIMAGE_AT_EL3
-BL32_CFLAGS += -DIMAGE_AT_EL1
+BL2U_CPPFLAGS += -DIMAGE_AT_EL1
+BL31_CPPFLAGS += -DIMAGE_AT_EL3
+BL32_CPPFLAGS += -DIMAGE_AT_EL1
 endif
 
 # Include the CPU specific operations makefile, which provides default