diff --git a/cppcheck_suppressions.conf b/cppcheck_suppressions.conf
index ade74ce73..e0e750bfa 100644
--- a/cppcheck_suppressions.conf
+++ b/cppcheck_suppressions.conf
@@ -13,3 +13,7 @@ uninitMemberVar:src/blackmisc/optional.h
 
 // False positive caused by missing support for C++11 feature
 unusedPrivateFunction:src/blackmisc/tuple_private.h
+
+// cppcheck shouldn’t assume operator* is commutative
+duplicateExpression:tests/blackmisc/testvectormatrix.cpp
+duplicateExpression:tests/blackmisc/testphysicalquantities.cpp