diff --git a/src/libGLESv2/ProgramBinary.cpp b/src/libGLESv2/ProgramBinary.cpp
index 005e319..7c8e466 100644
--- a/src/libGLESv2/ProgramBinary.cpp
+++ b/src/libGLESv2/ProgramBinary.cpp
@@ -3240,7 +3240,9 @@
 
     bool operator()(int a, int b)
     {
-        return originalIndices[a] == -1 ? false : originalIndices[a] < originalIndices[b];
+        if (originalIndices[a] == -1) return false;
+        if (originalIndices[b] == -1) return true;
+        return (originalIndices[a] < originalIndices[b]);
     }
 
     const int (&originalIndices)[MAX_VERTEX_ATTRIBS];