diff --git a/test/TestStdString/TestStdString.wit b/test/TestStdString/TestStdString.wit
index 6dd1f04..79c8f7f 100644
--- a/test/TestStdString/TestStdString.wit
+++ b/test/TestStdString/TestStdString.wit
@@ -11,3 +11,7 @@ export = "all"
 
 # all generated code in a single file:
 n_classes_per_file = 0
+
+# not working with CxxWrap 0.16 on MacOS and with 0.15 on both Linux and MacOS
+# forcing version to 0.14
+cxxwrap_version = "0.14"
diff --git a/test/TestStdVector/TestStdVector.wit b/test/TestStdVector/TestStdVector.wit
index 553aef4..f53a5ef 100644
--- a/test/TestStdVector/TestStdVector.wit
+++ b/test/TestStdVector/TestStdVector.wit
@@ -13,3 +13,8 @@ fields_and_variables = false
 
 # all generated code in a single file:
 #n_classes_per_file = 0
+
+# not working with CxxWrap 0.16 on MacOS and with 0.15 on both Linux and MacOS
+# forcing version to 0.14
+cxxwrap_version = "0.14"
+
diff --git a/test/TestUsingType/TestUsingType.wit b/test/TestUsingType/TestUsingType.wit
index 49c2a9b..cb84941 100644
--- a/test/TestUsingType/TestUsingType.wit
+++ b/test/TestUsingType/TestUsingType.wit
@@ -16,3 +16,6 @@ auto_veto = true
 # all generated code in a single file:
 n_classes_per_file = 0
 
+# not working with CxxWrap 0.16 on MacOS
+# forcing version to 0.14
+cxxwrap_version = "0.14"