diff --git a/src/sksl/SkSLCFGGenerator.cpp b/src/sksl/SkSLCFGGenerator.cpp
index 0b1e493..eb88e49c 100644
--- a/src/sksl/SkSLCFGGenerator.cpp
+++ b/src/sksl/SkSLCFGGenerator.cpp
@@ -256,7 +256,7 @@
             return true;
         case Expression::Kind::kPostfix:
             if (!this->tryRemoveExpressionBefore(iter,
-                                                 expr->as<PrefixExpression>().operand().get())) {
+                                                 expr->as<PostfixExpression>().operand().get())) {
                 return false;
             }
             *iter = fNodes.erase(*iter);