diff --git a/Makefile b/Makefile
index 23a1b0a..4519742 100644
--- a/Makefile
+++ b/Makefile
@@ -288,7 +288,7 @@
 
 ifneq (${SPD},none)
 ifeq (${ARCH},aarch32)
-	$(error "Error: SPD is incompatible with AArch32.")
+        $(error "Error: SPD is incompatible with AArch32.")
 endif
 ifdef EL3_PAYLOAD_BASE
         $(warning "SPD and EL3_PAYLOAD_BASE are incompatible build options.")