diff --git a/Lib/distutils/tests/test_config_cmd.py b/Lib/distutils/tests/test_config_cmd.py
index b735fd3..8bd2c94 100644
--- a/Lib/distutils/tests/test_config_cmd.py
+++ b/Lib/distutils/tests/test_config_cmd.py
@@ -47,8 +47,7 @@
         cmd = config(dist)
         cmd._check_compiler()
         compiler = cmd.compiler
-        is_xlc = shutil.which(compiler.preprocessor[0]).startswith("/usr/vac")
-        if is_xlc:
+        if sys.platform[:3] == "aix" and "xlc" in compiler.preprocessor[0].lower():
             self.skipTest('xlc: The -E option overrides the -P, -o, and -qsyntaxonly options')
 
         # simple pattern searches