diff --git a/src/utilities/x13/select_x13_binary.m b/src/utilities/x13/select_x13_binary.m
index 8eb3e85cd5b984569084c3a49123c45708f20a5f..22b22be7d1c75db1f900fd9e56cfe149a99a66a5 100644
--- a/src/utilities/x13/select_x13_binary.m
+++ b/src/utilities/x13/select_x13_binary.m
@@ -41,7 +41,7 @@ elseif isunix()
         x13_binary = sprintf('%s%s%s%s', x13_binary, '32', filesep(), 'x13as');
     end
     if ~exist(x13_binary, 'file')
-        [status, x13_binary] = system('which x13as');
+        [status, x13_binary] = system('command -v x13as');
         if ~status
             x13_binary = deblank(x13_binary);
         end