diff --git a/lib.c b/lib.c
index f9cb6ca..a365245 100644
--- a/lib.c
+++ b/lib.c
@@ -703,7 +703,7 @@
 	for ( ; *s; s++)
 		if (!(isalnum((uschar) *s) || *s == '_'))
 			break;
-	return *s == '=' && s > os && *(s+1) != '=';
+	return *s == '=' && s > os;
 }
 
 /* strtod is supposed to be a proper test of what's a valid number */