diff --git a/vendor/hlslparser/src/GLSLGenerator.cpp b/vendor/hlslparser/src/GLSLGenerator.cpp
index f836f381a7..47a0838864 100644
--- a/vendor/hlslparser/src/GLSLGenerator.cpp
+++ b/vendor/hlslparser/src/GLSLGenerator.cpp
@@ -887,9 +887,11 @@ void GLSLGenerator::OutputExpression(HLSLExpression* expression, const HLSLType*
         }
         else
         {
+            // Array subscript operator in GLSL requires an explicit int parameter
+            const HLSLType& intType = HLSLType(HLSLBaseType_Int);
             OutputExpression(arrayAccess->array);
             m_writer.Write("[");
-            OutputExpression(arrayAccess->index);
+            OutputExpression(arrayAccess->index, &intType);
             m_writer.Write("]");
         }