diff --git a/src/libstore-test-support/include/nix/store/tests/nix_api_store.hh b/src/libstore-test-support/include/nix/store/tests/nix_api_store.hh
index 63f80cf91..e51be3dab 100644
--- a/src/libstore-test-support/include/nix/store/tests/nix_api_store.hh
+++ b/src/libstore-test-support/include/nix/store/tests/nix_api_store.hh
@@ -34,6 +34,8 @@ public:
     Store * store;
     std::string nixDir;
     std::string nixStoreDir;
+    std::string nixStateDir;
+    std::string nixLogDir;
 
 protected:
     void init_local_store()
@@ -53,11 +55,13 @@ protected:
 #endif
 
         nixStoreDir = nixDir + "/my_nix_store";
+        nixStateDir = nixDir + "/my_state";
+        nixLogDir = nixDir + "/my_log";
 
         // Options documented in `nix help-stores`
         const char * p1[] = {"store", nixStoreDir.c_str()};
-        const char * p2[] = {"state", (new std::string(nixDir + "/my_state"))->c_str()};
-        const char * p3[] = {"log", (new std::string(nixDir + "/my_log"))->c_str()};
+        const char * p2[] = {"state", nixStateDir.c_str()};
+        const char * p3[] = {"log", nixLogDir.c_str()};
 
         const char ** params[] = {p1, p2, p3, nullptr};
 
diff --git a/src/libstore-tests/nix_api_store.cc b/src/libstore-tests/nix_api_store.cc
index 4eb95360a..3d9f7908b 100644
--- a/src/libstore-tests/nix_api_store.cc
+++ b/src/libstore-tests/nix_api_store.cc
@@ -71,17 +71,21 @@ TEST_F(nix_api_store_test, ReturnsValidStorePath)
     ASSERT_NE(result, nullptr);
     ASSERT_STREQ("name", result->path.name().data());
     ASSERT_STREQ(PATH_SUFFIX.substr(1).c_str(), result->path.to_string().data());
+    nix_store_path_free(result);
 }
 
 TEST_F(nix_api_store_test, SetsLastErrCodeToNixOk)
 {
-    nix_store_parse_path(ctx, store, (nixStoreDir + PATH_SUFFIX).c_str());
+    StorePath * path = nix_store_parse_path(ctx, store, (nixStoreDir + PATH_SUFFIX).c_str());
     ASSERT_EQ(ctx->last_err_code, NIX_OK);
+    nix_store_path_free(path);
 }
 
 TEST_F(nix_api_store_test, DoesNotCrashWhenContextIsNull)
 {
-    ASSERT_NO_THROW(nix_store_parse_path(ctx, store, (nixStoreDir + PATH_SUFFIX).c_str()));
+    StorePath * path = nullptr;
+    ASSERT_NO_THROW(path = nix_store_parse_path(ctx, store, (nixStoreDir + PATH_SUFFIX).c_str()));
+    nix_store_path_free(path);
 }
 
 TEST_F(nix_api_store_test, get_version)
@@ -119,6 +123,7 @@ TEST_F(nix_api_store_test, nix_store_is_valid_path_not_in_store)
 {
     StorePath * path = nix_store_parse_path(ctx, store, (nixStoreDir + PATH_SUFFIX).c_str());
     ASSERT_EQ(false, nix_store_is_valid_path(ctx, store, path));
+    nix_store_path_free(path);
 }
 
 TEST_F(nix_api_store_test, nix_store_real_path)