diff --git a/core/fpdfapi/font/cpdf_tounicodemap.cpp b/core/fpdfapi/font/cpdf_tounicodemap.cpp
index ce4246e..3c6e73e 100644
--- a/core/fpdfapi/font/cpdf_tounicodemap.cpp
+++ b/core/fpdfapi/font/cpdf_tounicodemap.cpp
@@ -6,7 +6,6 @@
 
 #include "core/fpdfapi/font/cpdf_tounicodemap.h"
 
-#include <map>
 #include <set>
 #include <utility>
 
diff --git a/core/fpdfapi/page/cpdf_expintfunc.h b/core/fpdfapi/page/cpdf_expintfunc.h
index 803b2ef..e4a973c 100644
--- a/core/fpdfapi/page/cpdf_expintfunc.h
+++ b/core/fpdfapi/page/cpdf_expintfunc.h
@@ -7,8 +7,6 @@
 #ifndef CORE_FPDFAPI_PAGE_CPDF_EXPINTFUNC_H_
 #define CORE_FPDFAPI_PAGE_CPDF_EXPINTFUNC_H_
 
-#include <set>
-
 #include "core/fpdfapi/page/cpdf_function.h"
 #include "core/fxcrt/data_vector.h"
 
diff --git a/core/fpdfapi/page/cpdf_psfunc.h b/core/fpdfapi/page/cpdf_psfunc.h
index ca0e63b..fd7a7d8 100644
--- a/core/fpdfapi/page/cpdf_psfunc.h
+++ b/core/fpdfapi/page/cpdf_psfunc.h
@@ -7,8 +7,6 @@
 #ifndef CORE_FPDFAPI_PAGE_CPDF_PSFUNC_H_
 #define CORE_FPDFAPI_PAGE_CPDF_PSFUNC_H_
 
-#include <set>
-
 #include "core/fpdfapi/page/cpdf_function.h"
 #include "core/fpdfapi/page/cpdf_psengine.h"
 
diff --git a/core/fpdfapi/page/cpdf_sampledfunc.h b/core/fpdfapi/page/cpdf_sampledfunc.h
index ccf3cfc..2497e8c 100644
--- a/core/fpdfapi/page/cpdf_sampledfunc.h
+++ b/core/fpdfapi/page/cpdf_sampledfunc.h
@@ -7,7 +7,6 @@
 #ifndef CORE_FPDFAPI_PAGE_CPDF_SAMPLEDFUNC_H_
 #define CORE_FPDFAPI_PAGE_CPDF_SAMPLEDFUNC_H_
 
-#include <set>
 #include <vector>
 
 #include "core/fpdfapi/page/cpdf_function.h"
diff --git a/core/fpdfapi/page/cpdf_stitchfunc.h b/core/fpdfapi/page/cpdf_stitchfunc.h
index 83b63b8..e3490e9 100644
--- a/core/fpdfapi/page/cpdf_stitchfunc.h
+++ b/core/fpdfapi/page/cpdf_stitchfunc.h
@@ -8,7 +8,6 @@
 #define CORE_FPDFAPI_PAGE_CPDF_STITCHFUNC_H_
 
 #include <memory>
-#include <set>
 #include <vector>
 
 #include "core/fpdfapi/page/cpdf_function.h"
diff --git a/core/fpdfapi/parser/cpdf_stream_acc.cpp b/core/fpdfapi/parser/cpdf_stream_acc.cpp
index 89902ec..4f42c6d 100644
--- a/core/fpdfapi/parser/cpdf_stream_acc.cpp
+++ b/core/fpdfapi/parser/cpdf_stream_acc.cpp
@@ -7,7 +7,6 @@
 #include "core/fpdfapi/parser/cpdf_stream_acc.h"
 
 #include <utility>
-#include <vector>
 
 #include "core/fdrm/fx_crypt.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
diff --git a/core/fpdfapi/parser/fpdf_parser_decode.cpp b/core/fpdfapi/parser/fpdf_parser_decode.cpp
index 3e71a58..6f29b7a 100644
--- a/core/fpdfapi/parser/fpdf_parser_decode.cpp
+++ b/core/fpdfapi/parser/fpdf_parser_decode.cpp
@@ -11,7 +11,6 @@
 
 #include <algorithm>
 #include <utility>
-#include <vector>
 
 #include "constants/stream_dict_common.h"
 #include "core/fpdfapi/parser/cpdf_array.h"
diff --git a/core/fxge/win32/cgdi_printer_driver.cpp b/core/fxge/win32/cgdi_printer_driver.cpp
index ae431c2..8286685 100644
--- a/core/fxge/win32/cgdi_printer_driver.cpp
+++ b/core/fxge/win32/cgdi_printer_driver.cpp
@@ -11,7 +11,6 @@
 
 #include <algorithm>
 #include <memory>
-#include <vector>
 
 #include "core/fxcrt/fx_memory.h"
 #include "core/fxcrt/fx_system.h"
diff --git a/testing/fake_file_access.cpp b/testing/fake_file_access.cpp
index de1ce8f..4bd8fa1 100644
--- a/testing/fake_file_access.cpp
+++ b/testing/fake_file_access.cpp
@@ -4,8 +4,6 @@
 
 #include "testing/fake_file_access.h"
 
-#include <algorithm>
-#include <set>
 #include <utility>
 
 #include "core/fxcrt/fx_system.h"
diff --git a/third_party/base/template_util.h b/third_party/base/template_util.h
index 895d8dc..f0c2564 100644
--- a/third_party/base/template_util.h
+++ b/third_party/base/template_util.h
@@ -10,7 +10,6 @@
 #include <iterator>
 #include <type_traits>
 #include <utility>
-#include <vector>
 
 #include "build/build_config.h"