diff --git a/flang/include/flang/Lower/Support/Utils.h b/flang/include/flang/Lower/Support/Utils.h
--- a/flang/include/flang/Lower/Support/Utils.h
+++ b/flang/include/flang/Lower/Support/Utils.h
@@ -35,13 +35,6 @@
   return {cb.begin(), cb.size()};
 }
 
-namespace fir {
-/// Return the integer value of a arith::ConstantOp.
-inline std::int64_t toInt(mlir::arith::ConstantOp cop) {
-  return cop.getValue().cast<mlir::IntegerAttr>().getValue().getSExtValue();
-}
-} // namespace fir
-
 /// Template helper to remove Fortran::common::Indirection wrappers.
 template <typename A>
 const A &removeIndirection(const A &a) {
diff --git a/flang/lib/Lower/IntrinsicCall.cpp b/flang/lib/Lower/IntrinsicCall.cpp
--- a/flang/lib/Lower/IntrinsicCall.cpp
+++ b/flang/lib/Lower/IntrinsicCall.cpp
@@ -16,7 +16,6 @@
 #include "flang/Lower/IntrinsicCall.h"
 #include "flang/Common/static-multimap-view.h"
 #include "flang/Lower/Mangler.h"
-#include "flang/Lower/Support/Utils.h"
 #include "flang/Optimizer/Builder/BoxValue.h"
 #include "flang/Optimizer/Builder/Character.h"
 #include "flang/Optimizer/Builder/Complex.h"
@@ -36,6 +35,7 @@
 #include "flang/Optimizer/Builder/Todo.h"
 #include "flang/Optimizer/Dialect/FIROpsSupport.h"
 #include "flang/Optimizer/Support/FatalError.h"
+#include "flang/Optimizer/Support/Utils.h"
 #include "flang/Runtime/entry-names.h"
 #include "mlir/Dialect/Complex/IR/Complex.h"
 #include "mlir/Dialect/LLVMIR/LLVMDialect.h"