diff --git a/cpp/ql/lib/semmle/code/cpp/controlflow/Nullness.qll b/cpp/ql/lib/semmle/code/cpp/controlflow/Nullness.qll
index 40c975873b4..fac6a57f8cf 100644
--- a/cpp/ql/lib/semmle/code/cpp/controlflow/Nullness.qll
+++ b/cpp/ql/lib/semmle/code/cpp/controlflow/Nullness.qll
@@ -46,7 +46,7 @@ predicate nullCheckExpr(Expr checkExpr, Variable var) {
     or
     exists(LogicalAndExpr op, AnalysedExpr child |
       expr = op and
-      op.getRightOperand() = child and
+      (op.getRightOperand() = child or op.getLeftOperand() = child) and
       nullCheckExpr(child, v)
     )
     or
@@ -99,7 +99,7 @@ predicate validCheckExpr(Expr checkExpr, Variable var) {
     or
     exists(LogicalAndExpr op, AnalysedExpr child |
       expr = op and
-      op.getRightOperand() = child and
+      (op.getRightOperand() = child or op.getLeftOperand() = child) and
       validCheckExpr(child, v)
     )
     or