diff --git a/src/detect-flowint.c b/src/detect-flowint.c
index 93922e8c9f..4771eade12 100644
--- a/src/detect-flowint.c
+++ b/src/detect-flowint.c
@@ -41,7 +41,7 @@
 #include "detect-engine-mpm.h"
 
 /*                         name             modifiers          value      */
-#define PARSE_REGEX "^\\s*([a-zA-Z][\\w\\d_]+)\\s*,\\s*([+=-]{1}|==|!=|<|<=|>|>=|isset|notset)\\s*,?\\s*([a-zA-Z][\\w\\d]+|[\\d]{1,10})?\\s*$"
+#define PARSE_REGEX "^\\s*([a-zA-Z][\\w\\d_.]+)\\s*,\\s*([+=-]{1}|==|!=|<|<=|>|>=|isset|notset)\\s*,?\\s*([a-zA-Z][\\w\\d]+|[\\d]{1,10})?\\s*$"
 /* Varnames must begin with a letter */
 
 static pcre *parse_regex;