diff --git a/src/util/ScreenshotUtil.cpp b/src/util/ScreenshotUtil.cpp
index 41f07544..ebd0889f 100644
--- a/src/util/ScreenshotUtil.cpp
+++ b/src/util/ScreenshotUtil.cpp
@@ -45,7 +45,7 @@ bool ScreenshotUtil::saveFramebufferAsBmp(const char* filename, const uint8_t* f
 
   std::string path(filename);
   size_t last_slash = path.find_last_of('/');
-  if (last_slash != std::string::npos) {
+  if (last_slash != std::string::npos && last_slash > 0) {
     std::string dir = path.substr(0, last_slash);
     if (!Storage.exists(dir.c_str())) {
       if (!Storage.mkdir(dir.c_str())) {