diff --git a/jni/libopus/sources/win32/genversion.bat b/jni/libopus/sources/win32/genversion.bat
index 7934ebf..a9b9353 100644
--- a/jni/libopus/sources/win32/genversion.bat
+++ b/jni/libopus/sources/win32/genversion.bat
@@ -2,7 +2,7 @@
 
 setlocal enableextensions enabledelayedexpansion
 
-for /f %%v in ('git describe --tags --match "v*"') do set version=%%v
+for /f %%v in ('git --git-dir="%~dp0..\.git" describe --tags --match "v*"') do set version=%%v
 
 if not "%version%"=="" goto :gotversion
 
@@ -16,7 +16,7 @@
 
 :getversion
 
-for /f "delims== tokens=2" %%v in (%~dp0..\version.mk) do set version=%%v
+for /f "delims== tokens=2" %%v in (%~dps0..\version.mk) do set version=%%v
 
 set version=!version:^"=!
 set version=!version: =!
@@ -26,7 +26,7 @@
 set version_out=#define %2 "%version%"
 set version_mk=%2 = "%version%"
 
-echo %version_out%> %1_temp
+echo %version_out%> "%1_temp"
 
 if %version%==unknown goto :skipgenerate
 
@@ -35,12 +35,12 @@
 
 :skipgenerate
 
-echo n | comp %1_temp %1 > NUL 2> NUL
+echo n | comp "%1_temp" "%1" > NUL 2> NUL
 
 if not errorlevel 1 goto exit
 
-copy /y %1_temp %1
+copy /y "%1_temp" "%1"
 
 :exit
 
-del %1_temp
+del "%1_temp"