diff --git a/config/setup/gzip.go b/config/setup/gzip.go
index 6372eacb..e78d374a 100644
--- a/config/setup/gzip.go
+++ b/config/setup/gzip.go
@@ -43,7 +43,7 @@ func gzipParse(c *Controller) ([]gzip.Config, error) {
 					return configs, c.ArgErr()
 				}
 				for _, e := range exts {
-					if !strings.HasPrefix(e, ".") && e != "*" {
+					if !strings.HasPrefix(e, ".") && e != gzip.ExtWildCard {
 						return configs, fmt.Errorf(`gzip: invalid extension "%v" (must start with dot)`, e)
 					}
 					extFilter.Exts.Add(e)
diff --git a/config/setup/gzip_test.go b/config/setup/gzip_test.go
index 30843e6b..22d01d7a 100644
--- a/config/setup/gzip_test.go
+++ b/config/setup/gzip_test.go
@@ -68,6 +68,11 @@ func TestGzip(t *testing.T) {
 		 level 3
 		}
 		`, false},
+		{`gzip { not /file
+		 ext *
+		 level 1
+		}
+		`, false},
 	}
 	for i, test := range tests {
 		c := NewTestController(test.input)
diff --git a/middleware/gzip/filter.go b/middleware/gzip/filter.go
index e490722b..ceac660e 100644
--- a/middleware/gzip/filter.go
+++ b/middleware/gzip/filter.go
@@ -33,14 +33,14 @@ type ExtFilter struct {
 }
 
 // extWildCard is the wildcard for extensions.
-const extWildCard = "*"
+const ExtWildCard = "*"
 
 // ShouldCompress checks if the request file extension matches any
 // of the registered extensions. It returns true if the extension is
 // found and false otherwise.
 func (e ExtFilter) ShouldCompress(r *http.Request) bool {
 	ext := path.Ext(r.URL.Path)
-	return e.Exts.Contains(extWildCard) || e.Exts.Contains(ext)
+	return e.Exts.Contains(ExtWildCard) || e.Exts.Contains(ext)
 }
 
 // PathFilter is Filter for request path.
diff --git a/middleware/gzip/filter_test.go b/middleware/gzip/filter_test.go
index 9cc4b8ba..f6537b9e 100644
--- a/middleware/gzip/filter_test.go
+++ b/middleware/gzip/filter_test.go
@@ -73,6 +73,13 @@ func TestExtFilter(t *testing.T) {
 			t.Errorf("Test %v: Should not be valid filter", i)
 		}
 	}
+	filter.(ExtFilter).Exts.Add(ExtWildCard)
+	for i, e := range exts {
+		r := urlRequest("file" + e)
+		if !filter.ShouldCompress(r) {
+			t.Errorf("Test %v: Should be valid filter. Wildcard used.", i)
+		}
+	}
 }
 
 func TestPathFilter(t *testing.T) {