diff --git a/dtool/pptempl/Template.msvc.pp b/dtool/pptempl/Template.msvc.pp
index 761d3124f7..8f66052adb 100644
--- a/dtool/pptempl/Template.msvc.pp
+++ b/dtool/pptempl/Template.msvc.pp
@@ -358,7 +358,8 @@ $[install_igatedb_dir]\$[igatedb] : $[so_dir]\$[igatedb]
 
 lib$[TARGET]_igatescan = $[osfilename $[igatescan]]
 $[so_dir]\$[igatedb] $[so_dir]\$[igateoutput] : $[filter-out .c .cxx,$[igatescan]]
-	interrogate -od $[so_dir]\$[igatedb] -oc $[so_dir]\$[igateoutput] $[interrogate_options] -module "$[igatemod]" -library "$[igatelib]" $(lib$[TARGET]_igatescan)
+// We use forward slash for interrogate because it prefers those.
+	interrogate -od $[so_dir]/$[igatedb] -oc $[so_dir]/$[igateoutput] $[interrogate_options] -module "$[igatemod]" -library "$[igatelib]" $(lib$[TARGET]_igatescan)
 
 #define target $[igateoutput:%.cxx=$[so_dir]\%.obj]
 #define source $[so_dir]\$[igateoutput]