diff --git a/src/system/kernel/device_manager/device_manager.cpp b/src/system/kernel/device_manager/device_manager.cpp
index 239ac4bb6e..ec71aa1294 100644
--- a/src/system/kernel/device_manager/device_manager.cpp
+++ b/src/system/kernel/device_manager/device_manager.cpp
@@ -1513,7 +1513,7 @@ device_node::_AddPath(Stack<KPath*>& stack, const char* basePath,
 	if (status == B_OK)
 		status = stack.Push(path);
 
-	TRACE(("  add path: \"%s\", %ld\n", path->Path(), status));
+	TRACE(("  add path: \"%s\", %" B_PRId32 "\n", path->Path(), status));
 
 	if (status != B_OK)
 		delete path;
diff --git a/src/system/kernel/fs/vfs_boot.cpp b/src/system/kernel/fs/vfs_boot.cpp
index 21b1b9e627..3361217a76 100644
--- a/src/system/kernel/fs/vfs_boot.cpp
+++ b/src/system/kernel/fs/vfs_boot.cpp
@@ -194,8 +194,8 @@ DiskBootMethod::IsBootDevice(KDiskDevice* device, bool strict)
 		return false;
 	}
 
-	TRACE(("boot device: bus %ld, device %ld\n", disk->bus_type,
-		disk->device_type));
+	TRACE(("boot device: bus %" B_PRId32 ", device %" B_PRId32 "\n",
+		disk->bus_type, disk->device_type));
 
 	// Assume that CD boots only happen off removable media.
 	if (fMethod == BOOT_METHOD_CD && !device->IsRemovable())