diff --git a/opengl/libagl/egl.cpp b/opengl/libagl/egl.cpp
index c44478d..4461567 100644
--- a/opengl/libagl/egl.cpp
+++ b/opengl/libagl/egl.cpp
@@ -1103,7 +1103,7 @@
         // default value
         if (binarySearch<config_pair_t>(
                 (config_pair_t const*)attrib_list,
-                0, numAttributes,
+                0, numAttributes-1,
                 config_defaults[j].key) < 0)
         {
             for (int i=0 ; i<numConfigs ; i++) {