diff --git a/src/duplicacy_utils.go b/src/duplicacy_utils.go
index 6fad983..5dda266 100644
--- a/src/duplicacy_utils.go
+++ b/src/duplicacy_utils.go
@@ -55,7 +55,7 @@ func IsEmptyFilter(pattern string) bool {
 }
 
 func IsUnspecifiedFilter(pattern string) bool {
-	if pattern[0] != '+' && pattern[0] != '-' && pattern[0] != 'i' && pattern[0] != 'e' {
+	if pattern[0] != '+' && pattern[0] != '-' && !strings.HasPrefix(pattern, "i:") && !strings.HasPrefix(pattern, "e:")  {
 		return true
 	} else {
 		return false
diff --git a/src/duplicacy_utils_test.go b/src/duplicacy_utils_test.go
index 82d508b..f53fa58 100644
--- a/src/duplicacy_utils_test.go
+++ b/src/duplicacy_utils_test.go
@@ -92,6 +92,17 @@ func TestMatchPattern(t *testing.T) {
 		}
 	}
 
+	for _, pattern := range []string{ "+", "-", "i:", "e:", "+a", "-a", "i:a", "e:a"} {
+		if IsUnspecifiedFilter(pattern) {
+			t.Errorf("pattern %s has a specified filter", pattern)
+		}
+	}
+
+	for _, pattern := range []string{ "i", "e", "ia", "ib", "a", "b"} {
+		if !IsUnspecifiedFilter(pattern) {
+			t.Errorf("pattern %s does not have a specified filter", pattern)
+		}
+	}
 }
 
 func TestRateLimit(t *testing.T) {