diff --git a/src/jrd/optimizer/Optimizer.cpp b/src/jrd/optimizer/Optimizer.cpp
index b19e27f47f..d34cc4aa9a 100644
--- a/src/jrd/optimizer/Optimizer.cpp
+++ b/src/jrd/optimizer/Optimizer.cpp
@@ -613,7 +613,6 @@ RecordSource* Optimizer::compile(RseNode* subRse, BoolExprNodeStack* parentStack
 			{
 				if (*selfIter == *subIter)
 				{
-					fb_assert(!(selfIter & (CONJUNCT_USED | CONJUNCT_MATCHED)));
 					selfIter |= (subIter & (CONJUNCT_USED | CONJUNCT_MATCHED));
 					break;
 				}