diff --git a/flang/lib/Optimizer/Transforms/SimplifyIntrinsics.cpp b/flang/lib/Optimizer/Transforms/SimplifyIntrinsics.cpp
--- a/flang/lib/Optimizer/Transforms/SimplifyIntrinsics.cpp
+++ b/flang/lib/Optimizer/Transforms/SimplifyIntrinsics.cpp
@@ -446,7 +446,7 @@
         //
         // Disable SUM inlining by default, because it fatally fails on some
         // FIR yet.
-        if (enableExperimental && funcName.startswith("_FortranASum")) {
+        if (funcName.startswith("_FortranASum")) {
           mlir::Operation::operand_range args = call.getArgs();
           // args[1] and args[2] are source filename and line number, ignored.
           const mlir::Value &dim = args[3];
diff --git a/flang/test/Transforms/simplifyintrinsics.fir b/flang/test/Transforms/simplifyintrinsics.fir
--- a/flang/test/Transforms/simplifyintrinsics.fir
+++ b/flang/test/Transforms/simplifyintrinsics.fir
@@ -1,4 +1,4 @@
-// RUN: fir-opt --split-input-file --simplify-intrinsics='enable-experimental=true' %s | FileCheck %s
+// RUN: fir-opt --split-input-file --simplify-intrinsics %s | FileCheck %s
 
 // Call to SUM with 1D I32 array is replaced.
 module attributes {fir.defaultkind = "a1c4d8i4l4r4", fir.kindmap = "", llvm.target_triple = "native"} {