diff --git a/Configure b/Configure
index c9dedcd37..fdf8d9a97 100755
--- a/Configure
+++ b/Configure
@@ -1584,13 +1584,13 @@ if ($strict_warnings)
 	die "ERROR --strict-warnings requires gcc or clang" unless ($ecc =~ /gcc$/ or $ecc =~ /clang$/);
 	foreach $wopt (split /\s+/, $gcc_devteam_warn)
 		{
-		$cflags .= " $wopt" unless ($cflags =~ /$wopt/)
+		$cflags .= " $wopt" unless ($cflags =~ /(^|\s)$wopt(\s|$)/)
 		}
 	if ($ecc eq "clang")
 		{
 		foreach $wopt (split /\s+/, $clang_devteam_warn)
 			{
-			$cflags .= " $wopt" unless ($cflags =~ /$wopt/)
+			$cflags .= " $wopt" unless ($cflags =~ /(^|\s)$wopt(\s|$)/)
 			}
 		}
 	}