diff --git a/pio-tools/pre_source_dir.py b/pio-tools/pre_source_dir.py
new file mode 100644
index 000000000..19198f394
--- /dev/null
+++ b/pio-tools/pre_source_dir.py
@@ -0,0 +1,12 @@
+import glob
+import os
+
+Import("env")
+
+def FindInoNodes(env):
+    src_dir = glob.escape(env.subst("$PROJECT_SRC_DIR"))
+    return env.Glob(os.path.join(src_dir, "*.ino")) + env.Glob(
+        os.path.join(src_dir, "ino_*", "*.ino")
+    )
+
+env.AddMethod(FindInoNodes)
diff --git a/platformio.ini b/platformio.ini
index 6b77f47c1..773eb4401 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -64,7 +64,8 @@ lib_extra_dirs              =
 ;bin_dir = /tmp/bin_files/
 
 [scripts_defaults]
-extra_scripts               = pio-tools/strip-floats.py
+extra_scripts               = pre:pio-tools/pre_source_dir.py
+                              pio-tools/strip-floats.py
                               pio-tools/name-firmware.py
                               pio-tools/gzip-firmware.py
                               pio-tools/override_copy.py