diff --git a/Makefile.cflags b/Makefile.cflags
index a39fc0bdcf..fe63998d56 100644
--- a/Makefile.cflags
+++ b/Makefile.cflags
@@ -52,6 +52,9 @@ endif
 # Forbid common symbols to prevent accidental aliasing.
 CFLAGS += -fno-common
 
+# Enable all default warnings
+CFLAGS += -Wall
+
 # Default ARFLAGS for platforms which do not specify it.
 # Note: make by default provides ARFLAGS=rv which we want to override
 ifeq ($(origin ARFLAGS),default)