diff --git a/expr.cpp b/expr.cpp
index c92503e0..222c89a1 100644
--- a/expr.cpp
+++ b/expr.cpp
@@ -7065,9 +7065,22 @@ TypeCastExpr::GetLValue(FunctionEmitContext *ctx) const {
 
 const Type *
 TypeCastExpr::GetType() const {
-    // We have to switch off this assert after supporting of operators.
-    //AssertPos(pos, type->HasUnboundVariability() == false);
-    return type;
+    // Here we try to resolve situation where (base_type) can be treated as
+    // (uniform base_type) of (varying base_type). This is a part of function
+    // TypeCastExpr::TypeCheck. After implementation of operators we
+    // have to have this functionality here.
+    const Type *toType = type, *fromType = expr->GetType();
+    if (toType == NULL || fromType == NULL)
+        return NULL;
+    if (toType->HasUnboundVariability()) {
+        if (fromType->IsUniformType()) {
+            toType = type->ResolveUnboundVariability(Variability::Uniform);
+        } else {
+            toType = type->ResolveUnboundVariability(Variability::Varying);
+        }
+    }
+    AssertPos(pos, toType->HasUnboundVariability() == false);
+    return toType;
 }