diff --git a/configure.in b/configure.in
index ad1f717b83fd..08a2986f2f41 100644
--- a/configure.in
+++ b/configure.in
@@ -3148,7 +3148,7 @@ fi
 dnl check whether to enable cairo
 dnl ========================================================
 MOZ_ARG_ENABLE_BOOL(cairo,
-[  --enable-cairo          Enable Cairo-specific features (Canvas)]
+[  --enable-cairo          Enable Cairo-specific features (Canvas)],
     MOZ_ENABLE_CAIRO=1,
     MOZ_ENABLE_CAIRO= )