diff --git a/Source/Platform.h b/Source/Platform.h
index cf578c07..1cd60d09 100644
--- a/Source/Platform.h
+++ b/Source/Platform.h
@@ -733,6 +733,8 @@ typedef struct _IMAGE_OPTIONAL_HEADER {
   DWORD NumberOfRvaAndSizes;
   IMAGE_DATA_DIRECTORY DataDirectory[IMAGE_NUMBEROF_DIRECTORY_ENTRIES];
 } IMAGE_OPTIONAL_HEADER,*PIMAGE_OPTIONAL_HEADER;
+#define IMAGE_NT_OPTIONAL_HDR32_MAGIC 0x10b
+#define IMAGE_NT_OPTIONAL_HDR64_MAGIC 0x20b
 typedef struct _IMAGE_NT_HEADERS {
   DWORD Signature;
   IMAGE_FILE_HEADER FileHeader;