diff --git a/opal/mca/paffinity/linux/paffinity_linux_module.c b/opal/mca/paffinity/linux/paffinity_linux_module.c
index 139fafd27e..dcdc89a005 100644
--- a/opal/mca/paffinity/linux/paffinity_linux_module.c
+++ b/opal/mca/paffinity/linux/paffinity_linux_module.c
@@ -122,7 +122,7 @@ static int make_mask(unsigned int *len, unsigned long **mask)
 
     linux_module_get_num_procs(&num_procs);
     *len = num_procs / 8;
-    if (*len != (unsigned int)num_procs * 8) {
+    if (*len != (unsigned int)(num_procs * 8)) {
         ++*len;
     }