diff --git a/dlls/mscoree/metahost.c b/dlls/mscoree/metahost.c
index 9a299662e38..77029942528 100644
--- a/dlls/mscoree/metahost.c
+++ b/dlls/mscoree/metahost.c
@@ -477,7 +477,7 @@ static BOOL get_install_root(LPWSTR install_dir)
     if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, dotnet_key, 0, KEY_READ, &key))
         return FALSE;
 
-    len = MAX_PATH;
+    len = MAX_PATH * sizeof(WCHAR);
     if (RegQueryValueExW(key, install_root, 0, NULL, (LPBYTE)install_dir, &len))
     {
         RegCloseKey(key);
diff --git a/dlls/mscoree/mscoree_main.c b/dlls/mscoree/mscoree_main.c
index 81fe5610b70..4679d79e662 100644
--- a/dlls/mscoree/mscoree_main.c
+++ b/dlls/mscoree/mscoree_main.c
@@ -80,7 +80,7 @@ static BOOL get_install_root(LPWSTR install_dir)
     if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, dotnet_key, 0, KEY_READ, &key))
         return FALSE;
 
-    len = MAX_PATH;
+    len = MAX_PATH * sizeof(WCHAR);
     if (RegQueryValueExW(key, install_root, 0, NULL, (LPBYTE)install_dir, &len))
     {
         RegCloseKey(key);