diff --git a/panda/src/glstuff/glShaderContext_src.cxx b/panda/src/glstuff/glShaderContext_src.cxx
index 7101fb62d0..50a40f4e30 100644
--- a/panda/src/glstuff/glShaderContext_src.cxx
+++ b/panda/src/glstuff/glShaderContext_src.cxx
@@ -1544,7 +1544,7 @@ issue_parameters(int altered) {
       }
 
       GLint p = spec._id._seqno;
-      int array_size = min(spec._dim[0], ptr_data->_size / spec._dim[1]);
+      int array_size = min(spec._dim[0], (int)ptr_data->_size / spec._dim[1]);
       switch (spec._type) {
       case Shader::SPT_float:
         {