diff --git a/BUILD.gn b/BUILD.gn
index 2021b4c..fea9e33 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -474,6 +474,12 @@
   if (is_posix) {
     configs -= [ "//build/config/gcc:no_exceptions" ]
   }
+
+  if (is_posix) {
+    # core/src/fxcodec/fx_libopenjpeg/src/fx_mct.c does an pointer-to-int
+    # conversion to check that an address is 16-bit aligned (benign).
+    cflags_c = [ "-Wno-pointer-to-int-cast" ]
+  }
   configs += [ ":pdfium_config", "//build/config/compiler:no_chromium_code" ]
 }
 
diff --git a/pdfium.gyp b/pdfium.gyp
index 390b3f0..7d62b1d 100644
--- a/pdfium.gyp
+++ b/pdfium.gyp
@@ -487,6 +487,13 @@
         'core/src/fxcodec/libjpeg/makefile',
         'core/src/fxcodec/libjpeg/transupp.h',
       ],
+      'conditions': [
+        ['os_posix==1', {
+          # core/src/fxcodec/fx_libopenjpeg/src/fx_mct.c does an pointer-to-int
+          # conversion to check that an address is 16-bit aligned (benign).
+          'cflags_c': [ '-Wno-pointer-to-int-cast' ],
+        }],
+      ],
     },
     {
       'target_name': 'fxcrt',