diff --git a/ext/zlib-wdk/install.props b/ext/zlib-wdk/install.props
index 7e419ff1..59db0974 100644
--- a/ext/zlib-wdk/install.props
+++ b/ext/zlib-wdk/install.props
@@ -18,7 +18,7 @@
       copy $(SolutionDir)x86\ZlibDllRelease\zlibwapi.lib $(SolutionDir)x86\dist\lib
       copy $(SolutionDir)x86\ZlibStatRelease\zlibstat.lib $(SolutionDir)x86\dist\lib
       copy $(SolutionDir)zlibvc.def $(SolutionDir)x86\dist\lib
-	  copy $(SolutionDir)LICENSE.ZLIB $(SolutionDir)x86\dist
+      copy $(SolutionDir)LICENSE.ZLIB $(SolutionDir)x86\dist
     </ZlibDoInstall32>
     <ZlibDoInstall64>
       mkdir $(SolutionDir)x64\dist
@@ -36,7 +36,7 @@
       copy $(SolutionDir)x64\ZlibDllRelease\zlibwapi.lib $(SolutionDir)x64\dist\lib
       copy $(SolutionDir)x64\ZlibStatRelease\zlibstat.lib $(SolutionDir)x64\dist\lib
       copy $(SolutionDir)zlibvc.def $(SolutionDir)x64\dist\lib
-	  copy $(SolutionDir)LICENSE.ZLIB $(SolutionDir)x86\dist
+      copy $(SolutionDir)LICENSE.ZLIB $(SolutionDir)x86\dist
     </ZlibDoInstall64>
   </PropertyGroup>
   <ItemDefinitionGroup>