diff --git a/tests/testcurl.pl b/tests/testcurl.pl
index 48f63369cb..fd9e7db88f 100755
--- a/tests/testcurl.pl
+++ b/tests/testcurl.pl
@@ -135,6 +135,9 @@ if ($^O eq 'MSWin32' || $targetos) {
   }
   elsif ($targetos =~ /mingw32/) {
     $binext = '.exe';
+    if ($^O eq 'MSWin32') {
+      $libext = '.a';
+    }
   }
   elsif ($targetos =~ /netware/) {
     $configurebuild = 0;