diff --git a/core/fxcodec/gif/cfx_gifcontext.cpp b/core/fxcodec/gif/cfx_gifcontext.cpp
index 9df818a..373bec0 100644
--- a/core/fxcodec/gif/cfx_gifcontext.cpp
+++ b/core/fxcodec/gif/cfx_gifcontext.cpp
@@ -18,7 +18,6 @@
 #include "core/fxcrt/byteorder.h"
 #include "core/fxcrt/compiler_specific.h"
 #include "core/fxcrt/data_vector.h"
-#include "core/fxcrt/stl_util.h"
 
 namespace fxcodec {
 
diff --git a/fpdfsdk/cpdfsdk_interactiveform.cpp b/fpdfsdk/cpdfsdk_interactiveform.cpp
index 0310b48..15318b3 100644
--- a/fpdfsdk/cpdfsdk_interactiveform.cpp
+++ b/fpdfsdk/cpdfsdk_interactiveform.cpp
@@ -27,7 +27,6 @@
 #include "core/fxcrt/autorestorer.h"
 #include "core/fxcrt/check.h"
 #include "core/fxcrt/fx_string_wrappers.h"
-#include "core/fxcrt/stl_util.h"
 #include "core/fxge/cfx_graphstatedata.h"
 #include "core/fxge/cfx_path.h"
 #include "fpdfsdk/cpdfsdk_annot.h"
diff --git a/fxbarcode/pdf417/BC_PDF417Writer.cpp b/fxbarcode/pdf417/BC_PDF417Writer.cpp
index 352e150..da2c27d 100644
--- a/fxbarcode/pdf417/BC_PDF417Writer.cpp
+++ b/fxbarcode/pdf417/BC_PDF417Writer.cpp
@@ -28,7 +28,6 @@
 #include <utility>
 
 #include "core/fxcrt/data_vector.h"
-#include "core/fxcrt/stl_util.h"
 #include "fxbarcode/BC_TwoDimWriter.h"
 #include "fxbarcode/pdf417/BC_PDF417.h"
 #include "fxbarcode/pdf417/BC_PDF417BarcodeMatrix.h"
diff --git a/xfa/fgas/layout/cfgas_breakline.cpp b/xfa/fgas/layout/cfgas_breakline.cpp
index e07cbbd..fbeb077 100644
--- a/xfa/fgas/layout/cfgas_breakline.cpp
+++ b/xfa/fgas/layout/cfgas_breakline.cpp
@@ -7,7 +7,6 @@
 #include "xfa/fgas/layout/cfgas_breakline.h"
 
 #include "core/fxcrt/check.h"
-#include "core/fxcrt/stl_util.h"
 
 CFGAS_BreakLine::CFGAS_BreakLine() = default;
 
diff --git a/xfa/fxfa/formcalc/cxfa_fmlexer.cpp b/xfa/fxfa/formcalc/cxfa_fmlexer.cpp
index 2ce52a8..2446dcc 100644
--- a/xfa/fxfa/formcalc/cxfa_fmlexer.cpp
+++ b/xfa/fxfa/formcalc/cxfa_fmlexer.cpp
@@ -10,7 +10,6 @@
 
 #include "core/fxcrt/compiler_specific.h"
 #include "core/fxcrt/fx_extension.h"
-#include "core/fxcrt/stl_util.h"
 
 namespace {