diff --git a/dlls/fusion/asmcache.c b/dlls/fusion/asmcache.c
index 668aa8777e9..deca5f4c37b 100644
--- a/dlls/fusion/asmcache.c
+++ b/dlls/fusion/asmcache.c
@@ -117,14 +117,14 @@ static BOOL get_assembly_directory(LPWSTR dir, DWORD size, const char *version,
     if (!strcmp(version, "v4.0.30319"))
     {
         strcpyW(dir + len, dotnet);
-        len += sizeof(dotnet)/sizeof(WCHAR) -1;
+        len += ARRAY_SIZE(dotnet) - 1;
         strcpyW(dir + len, gac + 1);
-        len += sizeof(gac)/sizeof(WCHAR) - 2;
+        len += ARRAY_SIZE(gac) - 2;
     }
     else
     {
         strcpyW(dir + len, gac);
-        len += sizeof(gac)/sizeof(WCHAR) - 1;
+        len += ARRAY_SIZE(gac) - 1;
     }
     switch (architecture)
     {
@@ -433,7 +433,7 @@ static HRESULT WINAPI IAssemblyCacheImpl_InstallAssembly(IAssemblyCache *iface,
     WCHAR asmdir[MAX_PATH], *p, **external_files = NULL, *dst_dir = NULL;
     PEKIND architecture;
     char *clr_version;
-    DWORD i, count = 0, src_len, dst_len = sizeof(format_v40)/sizeof(format_v40[0]);
+    DWORD i, count = 0, src_len, dst_len = ARRAY_SIZE(format_v40);
     HRESULT hr;
 
     TRACE("(%p, %d, %s, %p)\n", iface, dwFlags,
diff --git a/dlls/fusion/fusion.c b/dlls/fusion/fusion.c
index b038b380922..a57d7e067c5 100644
--- a/dlls/fusion/fusion.c
+++ b/dlls/fusion/fusion.c
@@ -144,9 +144,9 @@ HRESULT WINAPI GetCachePath(ASM_CACHE_FLAGS dwCacheFlags, LPWSTR pwzCachePath,
         case ASM_CACHE_GAC:
         {
             strcpyW(path + len, assembly);
-            len += sizeof(assembly)/sizeof(WCHAR) - 1;
+            len += ARRAY_SIZE(assembly) - 1;
             strcpyW(path + len, gac);
-            len += sizeof(gac)/sizeof(WCHAR) - 1;
+            len += ARRAY_SIZE(gac) - 1;
             break;
         }
         case ASM_CACHE_DOWNLOAD:
@@ -156,13 +156,13 @@ HRESULT WINAPI GetCachePath(ASM_CACHE_FLAGS dwCacheFlags, LPWSTR pwzCachePath,
         }
         case ASM_CACHE_ROOT:
             strcpyW(path + len, assembly);
-            len += sizeof(assembly)/sizeof(WCHAR) - 1;
+            len += ARRAY_SIZE(assembly) - 1;
             break;
         case ASM_CACHE_ROOT_EX:
             strcpyW(path + len, dotnet);
-            len += sizeof(dotnet)/sizeof(WCHAR) - 1;
+            len += ARRAY_SIZE(dotnet) - 1;
             strcpyW(path + len, assembly);
-            len += sizeof(assembly)/sizeof(WCHAR) - 1;
+            len += ARRAY_SIZE(assembly) - 1;
             break;
         default:
             return E_INVALIDARG;