diff --git a/src/interpreter/dll.c b/src/interpreter/dll.c
index dfc1e2d8..54f0297f 100644
--- a/src/interpreter/dll.c
+++ b/src/interpreter/dll.c
@@ -4,10 +4,8 @@
 
 #ifdef _WIN32
 
-#ifndef _WINDOWS_
-void* LoadLibraryA(const char*);
-void* GetProcAddress(void*, const char*);
-#endif
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
 
 #else
 #include <dlfcn.h>
diff --git a/src/modules/conio.c b/src/modules/conio.c
index 0bc43fcb..12ca2af4 100644
--- a/src/modules/conio.c
+++ b/src/modules/conio.c
@@ -3,6 +3,7 @@
 
 #if PY_SYS_PLATFORM == 0
 
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <conio.h>