diff --git a/src/fsfw_hal/host/HostFilesystem.cpp b/src/fsfw_hal/host/HostFilesystem.cpp
index f8739fb8..026910a6 100644
--- a/src/fsfw_hal/host/HostFilesystem.cpp
+++ b/src/fsfw_hal/host/HostFilesystem.cpp
@@ -178,6 +178,10 @@ ReturnValue_t HostFilesystem::isDirectory(const char *path, bool &isDirectory) {
 ReturnValue_t HostFilesystem::getBaseFilename(FilesystemParams params, char *nameBuf, size_t maxLen,
                                               size_t &baseNameLen) {
   std::string path(params.path);
+  size_t lastPos = path.find_last_of("/\\");
+  if (lastPos == std::string::npos) {
+    return returnvalue::FAILED;
+  }
   std::string baseName = path.substr(path.find_last_of("/\\") + 1);
   if (baseName.size() + 1 > maxLen) {
     return returnvalue::FAILED;