diff --git a/tests/std/run.pl b/tests/std/run.pl
index 004ae4ce689..6258d2ebcb0 100644
--- a/tests/std/run.pl
+++ b/tests/std/run.pl
@@ -34,7 +34,7 @@
 # add additional compiler flags if the compiler is cl.exe.
 if (not $ENV{PM_COMPILER})
 {
-    $ENV{CL} .= " " . $ENV{PM_CL_MSVC};
+    $ENV{PM_CL} .= " " . $ENV{PM_CL_MSVC};
 }
 
 my $RunPL = "";
diff --git a/tests/tr1/run.pl b/tests/tr1/run.pl
index 004ae4ce689..6258d2ebcb0 100644
--- a/tests/tr1/run.pl
+++ b/tests/tr1/run.pl
@@ -34,7 +34,7 @@
 # add additional compiler flags if the compiler is cl.exe.
 if (not $ENV{PM_COMPILER})
 {
-    $ENV{CL} .= " " . $ENV{PM_CL_MSVC};
+    $ENV{PM_CL} .= " " . $ENV{PM_CL_MSVC};
 }
 
 my $RunPL = "";