diff --git a/builder/frameworks/espidf.py b/builder/frameworks/espidf.py
index 107f2ef..0b8e356 100644
--- a/builder/frameworks/espidf.py
+++ b/builder/frameworks/espidf.py
@@ -59,12 +59,15 @@ TOOLCHAIN_DIR = platform.get_package_dir(
     )
 )
 
+# Legacy toolchains for mixed IDF/Arduino projects
+if "arduino" in env.subst("$PIOFRAMEWORK"):
+    TOOLCHAIN_DIR = platform.get_package_dir("toolchain-xtensa32")
+
 assert os.path.isdir(FRAMEWORK_DIR)
 assert os.path.isdir(TOOLCHAIN_DIR)
 
 # Arduino framework as a component is not compatible with ESP-IDF >=4.1
 if "arduino" in env.subst("$PIOFRAMEWORK"):
-    TOOLCHAIN_DIR = platform.get_package_dir("toolchain-xtensa32")
     ARDUINO_FRAMEWORK_DIR = platform.get_package_dir("framework-arduinoespressif32")
     # Possible package names in 'package@version' format is not compatible with CMake
     if "@" in os.path.basename(ARDUINO_FRAMEWORK_DIR):