diff --git a/src/c-wrapper/internal/c-tools.h b/src/c-wrapper/internal/c-tools.h
index 25aecf70d..b200979da 100644
--- a/src/c-wrapper/internal/c-tools.h
+++ b/src/c-wrapper/internal/c-tools.h
@@ -367,8 +367,9 @@ public:
 	>
 	static inline bctbx_list_t *getResolvedCListFromCppList (const std::list<std::shared_ptr<CppType>> &cppList) {
 		bctbx_list_t *result = nullptr;
-		for (const auto &value : cppList)
-			result = bctbx_list_append(result, getCBackPtr(value));
+		for (const auto &value : cppList) {
+			result = bctbx_list_append(result, belle_sip_object_ref(getCBackPtr(value)));
+		}
 		return result;
 	}
 
@@ -379,7 +380,7 @@ public:
 	static inline bctbx_list_t *getResolvedCListFromCppList (const std::list<CppType> &cppList) {
 		bctbx_list_t *result = nullptr;
 		for (const auto &value : cppList)
-			result = bctbx_list_append(result, getCBackPtr(value));
+			result = bctbx_list_append(result, belle_sip_object_ref(getCBackPtr(value)));
 		return result;
 	}