diff --git a/ext/dl/test/test_all.rb b/ext/dl/test/test_all.rb
index cf391dd6ab..fb1f4939f9 100644
--- a/ext/dl/test/test_all.rb
+++ b/ext/dl/test/test_all.rb
@@ -6,6 +6,6 @@ require 'test_func'
 require 'test_import'
 
 case RUBY_PLATFORM
-when /cygwin/, /mingw32/, /mswin32/
+when /cygwin/, /mingw32/, /mswin32/, /bccwin32/
   require 'test_win32'
 end
diff --git a/ext/dl/test/test_base.rb b/ext/dl/test/test_base.rb
index bf35d7a621..fc72db4e5e 100644
--- a/ext/dl/test/test_base.rb
+++ b/ext/dl/test/test_base.rb
@@ -8,9 +8,9 @@ when /cygwin/
 when /linux/
   LIBC_SO = "/lib/libc.so.6"
   LIBM_SO = "/lib/libm.so.6"
-when /mingw/, /msvcrt/
-  LIBC_SO = "C:\\WINDOWS\\system32\\msvcrt.dll"
-  LIBM_SO = "C:\\WINDOWS\\system32\\msvcrt.dll"
+when /mingw/, /mswin32/
+  LIBC_SO = "msvcrt.dll"
+  LIBM_SO = "msvcrt.dll"
 else
   LIBC_SO = ARGV[0]
   LIBM_SO = ARGV[1]