diff --git a/src/afs/SOLARIS/osi_groups.c b/src/afs/SOLARIS/osi_groups.c
index a33736d8b4..527964b9f6 100644
--- a/src/afs/SOLARIS/osi_groups.c
+++ b/src/afs/SOLARIS/osi_groups.c
@@ -107,7 +107,7 @@ pag_to_gidset(afs_uint32 pagvalue, gid_t *gidset, int *a_ngroups,
         }
     }
 
-    if (gidslot != NULL) {
+    if (gidslot == NULL) {
         /* If we don't already have a PAG, grow the groups list by one, and put
          * our PAG in the new empty slot. */
         if ((sizeof(gidset[0])) * (ngroups + 1) > gidset_sz) {