diff --git a/Makefile b/Makefile
index 127c0ce00..43331e1ee 100644
--- a/Makefile
+++ b/Makefile
@@ -127,7 +127,7 @@ compressed: $(ALL_COMPRESSED_FILES)
 
 check_compress_tool:
 ifdef MISSING_ZOPFLI
-	$(error "Missing $(ZOPFLIPNG). Try 'brew install zopfli' (Mac) or 'sudo apt-get zopfli' (linux)")
+	$(error "Missing $(ZOPFLIPNG). Try 'brew install zopfli' (Mac) or 'sudo apt-get install zopfli' (linux)")
 endif
 
 check_vs_adder: