diff --git a/configure.in b/configure.in
index d3d82310ad..6018a0a8bc 100644
--- a/configure.in
+++ b/configure.in
@@ -4375,7 +4375,7 @@ AC_CONFIG_FILES(Makefile, [
 [EXEEXT='$EXEEXT' gnumake='$gnumake'])
 
 AC_ARG_WITH([ruby-pc],
-	    AC_HELP_STRING([--with-ruby-pc=FILNAME], [pc file basename]),
+	    AC_HELP_STRING([--with-ruby-pc=FILENAME], [pc file basename]),
 	    [ruby_pc="$withval"],
 	    [ruby_pc="${RUBY_BASE_NAME}-${MAJOR}.${MINOR}.pc"])
 AC_SUBST(ruby_pc)