diff --git a/app/common/crashpadinterface.cpp b/app/common/crashpadinterface.cpp
index 70c30076f..d9b6fcb86 100644
--- a/app/common/crashpadinterface.cpp
+++ b/app/common/crashpadinterface.cpp
@@ -32,7 +32,7 @@
 #include "crashpadutils.h"
 #include "filefunctions.h"
 
-#ifdef OS_WIN
+#ifdef BUILDFLAG(IS_WIN)
 #include <Windows.h>
 #endif
 
diff --git a/app/common/crashpadutils.h b/app/common/crashpadutils.h
index 88b332a76..8b0e3e6d7 100644
--- a/app/common/crashpadutils.h
+++ b/app/common/crashpadutils.h
@@ -24,17 +24,17 @@
 #include <client/crashpad_client.h>
 
 // Copied from base::FilePath to match its macro
-#if defined(OS_POSIX)
+#if BUILDFLAG(IS_POSIX)
 // On most platforms, native pathnames are char arrays, and the encoding
 // may or may not be specified.  On Mac OS X, native pathnames are encoded
 // in UTF-8.
 #define QSTRING_TO_BASE_STRING(x) x.toStdString()
 #define BASE_STRING_TO_QSTRING(x) QString::fromStdString(x)
-#elif defined(OS_WIN)
+#elif BUILDFLAG(IS_WIN)
 // On Windows, for Unicode-aware applications, native pathnames are wchar_t
 // arrays encoded in UTF-16.
 #define QSTRING_TO_BASE_STRING(x) x.toStdWString()
 #define BASE_STRING_TO_QSTRING(x) QString::fromStdWString(x)
-#endif  // OS_WIN
+#endif  // BUILDFLAG(IS_WIN)
 
 #endif // CRASHPADUTILS_H