diff --git a/dlls/mscoree/corruntimehost.c b/dlls/mscoree/corruntimehost.c
index 64f345d850f..0c933cac299 100644
--- a/dlls/mscoree/corruntimehost.c
+++ b/dlls/mscoree/corruntimehost.c
@@ -1607,7 +1607,6 @@ HRESULT RuntimeHost_GetInterface(RuntimeHost *This, REFCLSID clsid, REFIID riid,
 }
 
 #define CHARS_IN_GUID 39
-#define ARRAYSIZE(array) (sizeof(array)/sizeof((array)[0]))
 
 HRESULT create_monodata(REFIID riid, LPVOID *ppObj )
 {
@@ -1618,7 +1617,7 @@ HRESULT create_monodata(REFIID riid, LPVOID *ppObj )
     static const WCHAR wszCLSIDSlash[] = {'C','L','S','I','D','\\',0};
     static const WCHAR wszInprocServer32[] = {'\\','I','n','p','r','o','c','S','e','r','v','e','r','3','2',0};
     static const WCHAR wszDLL[] = {'.','d','l','l',0};
-    WCHAR path[CHARS_IN_GUID + ARRAYSIZE(wszCLSIDSlash) + ARRAYSIZE(wszInprocServer32) - 1];
+    WCHAR path[CHARS_IN_GUID + ARRAY_SIZE(wszCLSIDSlash) + ARRAY_SIZE(wszInprocServer32) - 1];
     MonoDomain *domain;
     MonoAssembly *assembly;
     ICLRRuntimeInfo *info = NULL;