diff --git a/client/common/cmdline.c b/client/common/cmdline.c
index cfb109493..54dacda93 100644
--- a/client/common/cmdline.c
+++ b/client/common/cmdline.c
@@ -2092,7 +2092,7 @@ int freerdp_client_settings_parse_command_line_arguments(rdpSettings* settings,
 		}
 		CommandLineSwitchCase(arg, "compression-level")
 		{
-			unsigned long val = strtol(arg->Value, NULL, 0);
+			unsigned long val = strtoul(arg->Value, NULL, 0);
 
 			if ((errno != 0) || (val > UINT32_MAX))
 				return COMMAND_LINE_ERROR_UNEXPECTED_VALUE;