diff --git a/common.c b/common.c
index 579b94b70..82e67db42 100644
--- a/common.c
+++ b/common.c
@@ -927,6 +927,7 @@ wchar_t *escape( const wchar_t *in,
 			case L':':
 			case L'\'':
 			case L'\"':
+			case L'%':
 				if( escape_all )
 					*pos++ = L'\\';
 				*pos++ = *in;