diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9ddd49a..e2a3676 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,6 +28,7 @@ endif ()
 if (NOT MSVC)
     add_definitions ("-Wall")
 else ()
+    # Show level 4 warnings.
     add_definitions ("-W4")
 endif ()
 
diff --git a/MemoryModule.c b/MemoryModule.c
index 200e60f..3a6162a 100644
--- a/MemoryModule.c
+++ b/MemoryModule.c
@@ -35,6 +35,10 @@
 #if _MSC_VER
 // Disable warning about data -> function pointer conversion
 #pragma warning(disable:4055)
+ // C4244: conversion from 'uintptr_t' to 'DWORD', possible loss of data.
+#pragma warning(error: 4244)
+// C4267: conversion from 'size_t' to 'int', possible loss of data.
+#pragma warning(error: 4267)
 #endif
 
 #ifndef IMAGE_SIZEOF_BASE_RELOCATION