Accept any single character arguments including '-'
diff --git a/parser_private.go b/parser_private.go
index e25cffd..f361aec 100644
--- a/parser_private.go
+++ b/parser_private.go
@@ -170,7 +170,7 @@
 			arg = *argument
 		} else {
 			arg = s.pop()
-			if argumentIsOption(arg) {
+			if len(arg) > 1 && argumentIsOption(arg) {
 				return newErrorf(ErrExpectedArgument, "expected argument for flag `%s', but got option `%s'", option, arg)
 			}
 		}
diff --git a/parser_test.go b/parser_test.go
index 30ecb5e..9b5d8f7 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -328,9 +328,21 @@
 			errMsg:      "expected argument for flag `--string-slice', but got option `--other-option'",
 		},
 		{
+			// long option must not be accepted as argument
+			args:        []string{"--string-slice", "--"},
+			expectError: true,
+			errType:     ErrExpectedArgument,
+			errMsg:      "expected argument for flag `--string-slice', but got option `--'",
+		},
+
+		{
 			// quoted and appended option should be accepted as argument (even if it looks like an option)
 			args: []string{"--string-slice", "foobar", "--string-slice=\"--other-option\""},
 		},
+		{
+			//Accept any single character arguments including '-'
+			args: []string{"--string-slice", "-"},
+		},
 	}
 	var opts struct {
 		StringSlice []string `long:"string-slice"`