--- source/common/uloc.c	2011-12-12 04:50:00.601092000 -0500
+++ source/common/uloc.c	2011-12-12 04:56:18.503570000 -0500
@@ -1712,7 +1712,7 @@
         /* Check for EURO variants. */
         sawEuro = _deleteVariant(variant, variantSize, "EURO", 4);
         len -= sawEuro;
-        if (sawEuro > 0 && name[len-1] == '_') { /* delete trailing '_' */
+        if (sawEuro > 0 && len > 0 && name[len-1] == '_') { /* delete trailing '_' */
             --len;
         }