diff --git a/channels/audin/client/audin_main.c b/channels/audin/client/audin_main.c
index 08a670cb9..35d4d89fd 100644
--- a/channels/audin/client/audin_main.c
+++ b/channels/audin/client/audin_main.c
@@ -941,7 +941,7 @@ BOOL audin_process_addin_args(AUDIN_PLUGIN* audin, const ADDIN_ARGV* args)
 		}
 		CommandLineSwitchCase(arg, "rate")
 		{
-			long val = strtol(arg->Value, NULL, 0);
+			unsigned long val = strtoul(arg->Value, NULL, 0);
 
 			if ((errno != 0) || (val == 0) || (val > UINT32_MAX))
 				return FALSE;