diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index cb1d8b84ca4..1286eba035d 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -370,7 +370,7 @@ void CTxMemPoolEntry::UpdateDescendantState(int32_t modifySize, CAmount modifyFe
     nSizeWithDescendants += modifySize;
     assert(nSizeWithDescendants > 0);
     nModFeesWithDescendants = SaturatingAdd(nModFeesWithDescendants, modifyFee);
-    nCountWithDescendants += modifyCount;
+    nCountWithDescendants += uint64_t(modifyCount);
     assert(int64_t(nCountWithDescendants) > 0);
 }
 
@@ -379,7 +379,7 @@ void CTxMemPoolEntry::UpdateAncestorState(int32_t modifySize, CAmount modifyFee,
     nSizeWithAncestors += modifySize;
     assert(nSizeWithAncestors > 0);
     nModFeesWithAncestors = SaturatingAdd(nModFeesWithAncestors, modifyFee);
-    nCountWithAncestors += modifyCount;
+    nCountWithAncestors += uint64_t(modifyCount);
     assert(int64_t(nCountWithAncestors) > 0);
     nSigOpCostWithAncestors += modifySigOps;
     assert(int(nSigOpCostWithAncestors) >= 0);
diff --git a/test/sanitizer_suppressions/ubsan b/test/sanitizer_suppressions/ubsan
index 6b891c462e4..ae70fb49d48 100644
--- a/test/sanitizer_suppressions/ubsan
+++ b/test/sanitizer_suppressions/ubsan
@@ -56,7 +56,6 @@ implicit-integer-sign-change:prevector.h
 implicit-integer-sign-change:script/bitcoinconsensus.cpp
 implicit-integer-sign-change:script/interpreter.cpp
 implicit-integer-sign-change:serialize.h
-implicit-integer-sign-change:txmempool.cpp
 implicit-signed-integer-truncation:crypto/
 implicit-unsigned-integer-truncation:crypto/
 shift-base:arith_uint256.cpp