diff --git a/samples/image_diff_png.h b/samples/image_diff_png.h
index ea77e9a..9febb37 100644
--- a/samples/image_diff_png.h
+++ b/samples/image_diff_png.h
@@ -5,6 +5,8 @@
 #ifndef TOOLS_IMAGEDIFF_IMAGE_DIFF_PNG_H_
 #define TOOLS_IMAGEDIFF_IMAGE_DIFF_PNG_H_
 
+#include <stdlib.h>  // for size_t.
+
 #include <vector>
 
 namespace image_diff_png {
diff --git a/samples/samples.gyp b/samples/samples.gyp
index 9d316ec..e559790 100644
--- a/samples/samples.gyp
+++ b/samples/samples.gyp
@@ -24,7 +24,7 @@
       'variables': { 'enable_wexit_time_destructors': 1, },
       'dependencies': [
         '../pdfium.gyp:fxcodec',
-        '../third_party/third_party.gyp:safemath',
+        '../third_party/third_party.gyp:pdfium_base',
       ],
       'include_dirs': [
         '../../',