diff --git a/src/tools/msvc/install.pl b/src/tools/msvc/install.pl
index b2d7f9e040..90425ca8fc 100755
--- a/src/tools/msvc/install.pl
+++ b/src/tools/msvc/install.pl
@@ -6,6 +6,10 @@
 use strict;
 use warnings;
 
+use File::Basename;
+use File::Spec;
+BEGIN  { use lib File::Spec->rel2abs(dirname(__FILE__)); }
+
 use Install qw(Install);
 
 # buildenv.pl is for specifying the build environment settings
diff --git a/src/tools/msvc/mkvcbuild.pl b/src/tools/msvc/mkvcbuild.pl
index 9255dff022..34e861375c 100644
--- a/src/tools/msvc/mkvcbuild.pl
+++ b/src/tools/msvc/mkvcbuild.pl
@@ -7,6 +7,10 @@
 use strict;
 use warnings;
 
+use File::Basename;
+use File::Spec;
+BEGIN  { use lib File::Spec->rel2abs(dirname(__FILE__)); }
+
 use Mkvcbuild;
 
 chdir('..\..\..') if (-d '..\msvc' && -d '..\..\..\src');
diff --git a/src/tools/msvc/vcregress.pl b/src/tools/msvc/vcregress.pl
index ce5c976c16..26ab707d9f 100644
--- a/src/tools/msvc/vcregress.pl
+++ b/src/tools/msvc/vcregress.pl
@@ -11,6 +11,8 @@ use File::Basename;
 use File::Copy;
 use File::Find ();
 use File::Path qw(rmtree);
+use File::Spec;
+BEGIN  { use lib File::Spec->rel2abs(dirname(__FILE__)); }
 
 use Install qw(Install);