diff --git a/mbuni/configure.ac b/mbuni/configure.ac
index c8319ff..aa290c7 100644
--- a/mbuni/configure.ac
+++ b/mbuni/configure.ac
@@ -82,7 +82,7 @@ case "$host" in
     LIB_EXT="dylib"
     ;;
   *-linux*)
-    CFLAGS="$CFLAGS -D_XOPEN_SOURCE=600 -D_BSD_SOURCE -O4 -Walli -D_REENTRANT=1"
+    CFLAGS="$CFLAGS -D_XOPEN_SOURCE=600 -D_BSD_SOURCE -O4 -Wall -D_REENTRANT=1"
     LDFLAGS="$LDFLAGS -rdynamic"
     ;;
   *-*-openbsd*)