diff --git a/src/galois.c b/src/galois.c
index cd9faa8..8f7697c 100644
--- a/src/galois.c
+++ b/src/galois.c
@@ -304,6 +304,10 @@ void galois_w08_region_multiply(char *region,      /* Region to multiply */
   if (gfp_array[8] == NULL) {
     galois_init(8);
   }
+  if (r2 == NULL) {
+    r2 = region;
+    add = 0; 
+  }
   gfp_array[8]->multiply_region.w32(gfp_array[8], region, r2, multby, nbytes, add);
 }
 
@@ -316,6 +320,10 @@ void galois_w16_region_multiply(char *region,      /* Region to multiply */
   if (gfp_array[16] == NULL) {
     galois_init(16);
   }
+  if (r2 == NULL) {
+    r2 = region;
+    add = 0; 
+  }
   gfp_array[16]->multiply_region.w32(gfp_array[16], region, r2, multby, nbytes, add);
 }
 
@@ -329,6 +337,10 @@ void galois_w32_region_multiply(char *region,      /* Region to multiply */
   if (gfp_array[32] == NULL) {
     galois_init(32);
   }
+  if (r2 == NULL) {
+    r2 = region;
+    add = 0; 
+  }
   gfp_array[32]->multiply_region.w32(gfp_array[32], region, r2, multby, nbytes, add);
 }