diff --git a/ChangeLog b/ChangeLog
index 00bf5af..321319a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,6 +9,7 @@ ChangeLog
  * could not show module info in admin page when XCache is the last module
  * wrong http auth realm
  * #86: remove/edit variable in admin page
+ * fixed #109: fast inc/dec was trying to break ro protection
  * fixed #101, #105: Fixed compatibility issue for apache 1.x
  * fixed #94: Garbage collector disabled when xcache.cacher set to off
  * fixed #92: Zend Optimizer compatibility issue
diff --git a/xcache.c b/xcache.c
index 71a441f..1cc2f12 100644
--- a/xcache.c
+++ b/xcache.c
@@ -2185,13 +2185,16 @@ static inline void xc_var_inc_dec(int inc, INTERNAL_FUNCTION_PARAMETERS) /* {{{
 				/* do it in place */
 				stored_var = stored_xce->data.var;
 				if (Z_TYPE_P(stored_var->value) == IS_LONG) {
+					zval *zv;
 					stored_xce->ctime = XG(request_time);
 					stored_xce->ttl   = xce.ttl;
 					TRACE("%s", "incdec: islong");
 					value = Z_LVAL_P(stored_var->value);
 					value += (inc == 1 ? count : - count);
 					RETVAL_LONG(value);
-					Z_LVAL_P(stored_var->value) = value;
+
+					zv = (zval *) xce.cache->shm->handlers->to_readwrite(xce.cache->shm, (char *) stored_var->value);
+					Z_LVAL_P(zv) = value;
 					break; /* leave lock */
 				}
 				else {