diff --git a/build.sh b/build.sh
index 6465096..23d4739 100755
--- a/build.sh
+++ b/build.sh
@@ -6,6 +6,6 @@ opt="-O2 -march=native"
 libs="-I/usr/include/libdrm -ldrm -lm"
 defs="-D_POSIX_C_SOURCE=200809L"
 
-$cc $flags $libs $defs \
+$cc $warn $flags $libs $defs \
 	-o asteroids \
 	fb.c input.c main.c maths.c renderer.c