diff --git a/dlls/quartz/filtermapper.c b/dlls/quartz/filtermapper.c
index d78f6434989..d189d1dbacc 100644
--- a/dlls/quartz/filtermapper.c
+++ b/dlls/quartz/filtermapper.c
@@ -43,8 +43,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(quartz);
 
-#define ARRAYSIZE(array) (sizeof(array)/sizeof((array)[0]))
-
 typedef struct FilterMapper3Impl
 {
     IUnknown IUnknown_inner;
@@ -264,7 +262,7 @@ static HRESULT WINAPI FilterMapper3_CreateCategory(
 {
     LPWSTR wClsidAMCat = NULL;
     LPWSTR wClsidCategory = NULL;
-    WCHAR wszKeyName[ARRAYSIZE(wszClsidSlash)-1 + ARRAYSIZE(wszSlashInstance)-1 + (CHARS_IN_GUID-1) * 2 + 1];
+    WCHAR wszKeyName[ARRAY_SIZE(wszClsidSlash)-1 + ARRAY_SIZE(wszSlashInstance)-1 + (CHARS_IN_GUID-1) * 2 + 1];
     HKEY hKey = NULL;
     LONG lRet;
     HRESULT hr;
@@ -1268,7 +1266,7 @@ static HRESULT WINAPI FilterMapper_RegisterFilter(IFilterMapper * iface, CLSID c
     LPWSTR wszClsid = NULL;
     HKEY hKey;
     LONG lRet;
-    WCHAR wszKeyName[ARRAYSIZE(wszFilterSlash)-1 + (CHARS_IN_GUID-1) + 1];
+    WCHAR wszKeyName[ARRAY_SIZE(wszFilterSlash)-1 + (CHARS_IN_GUID-1) + 1];
 
     TRACE("(%p)->(%s, %s, %x)\n", iface, debugstr_guid(&clsid), debugstr_w(szName), dwMerit);
 
@@ -1337,7 +1335,7 @@ static HRESULT WINAPI FilterMapper_RegisterPin(
     HKEY hKey = NULL;
     HKEY hPinsKey = NULL;
     WCHAR * wszPinsKeyName;
-    WCHAR wszKeyName[ARRAYSIZE(wszClsidSlash)-1 + (CHARS_IN_GUID-1) + 1];
+    WCHAR wszKeyName[ARRAY_SIZE(wszClsidSlash)-1 + (CHARS_IN_GUID-1) + 1];
 
     TRACE("(%p)->(%s, %s, %d, %d, %d, %d, %s, %s)\n", iface, debugstr_guid(&Filter), debugstr_w(szName), bRendered,
                 bOutput, bZero, bMany, debugstr_guid(&ConnectsToFilter), debugstr_w(ConnectsToPin));
@@ -1498,7 +1496,7 @@ static HRESULT WINAPI FilterMapper_UnregisterFilter(IFilterMapper * iface, CLSID
     LONG lRet;
     LPWSTR wszClsid = NULL;
     HKEY hKey;
-    WCHAR wszKeyName[ARRAYSIZE(wszClsidSlash)-1 + (CHARS_IN_GUID-1) + 1];
+    WCHAR wszKeyName[ARRAY_SIZE(wszClsidSlash)-1 + (CHARS_IN_GUID-1) + 1];
 
     TRACE("(%p)->(%s)\n", iface, debugstr_guid(&Filter));
 
@@ -1563,7 +1561,7 @@ static HRESULT WINAPI FilterMapper_UnregisterPin(IFilterMapper * iface, CLSID Fi
     LPWSTR wszClsid = NULL;
     HKEY hKey = NULL;
     WCHAR * wszPinNameKey;
-    WCHAR wszKeyName[ARRAYSIZE(wszClsidSlash)-1 + (CHARS_IN_GUID-1) + 1];
+    WCHAR wszKeyName[ARRAY_SIZE(wszClsidSlash)-1 + (CHARS_IN_GUID-1) + 1];
 
     TRACE("(%p)->(%s, %s)\n", iface, debugstr_guid(&Filter), debugstr_w(Name));