diff --git a/php5/ext/snmp/config.m4 b/php5/ext/snmp/config.m4
index bc51ce2..5525ddd 100644
--- a/php5/ext/snmp/config.m4
+++ b/php5/ext/snmp/config.m4
@@ -54,7 +54,7 @@ if test "$PHP_SNMP" != "no"; then
     else
       SNMP_INCDIR=$PHP_SNMP/include
       test -d $PHP_SNMP/include/ucd-snmp && SNMP_INCDIR=$PHP_SNMP/include/ucd-snmp
-      SNMP_LIBDIR=$PHP_SNMP/lib
+      SNMP_LIBDIR=$PHP_SNMP/$PHP_LIBDIR
     fi
 
     if test -z "$SNMP_INCDIR"; then