diff --git a/patches/piper_CMakeLists.txt b/patches/piper_CMakeLists.txt
index 167c04d..528ddc9 100644
--- a/patches/piper_CMakeLists.txt
+++ b/patches/piper_CMakeLists.txt
@@ -60,12 +60,12 @@ endif()
 
 if(NOT DEFINED PIPER_PHONEMIZE_DIR)
   set(PIPER_PHONEMIZE_DIR "${CMAKE_CURRENT_BINARY_DIR}/pi")
-  set(ONNXRUNTIME_VERSION "${ONNXRUNTIME_VERSION}")
+  set(ONNXRUNTIME_VERSION "$ENV{ONNXRUNTIME_VERSION}")
   ExternalProject_Add(
     piper_phonemize_external
     PREFIX "${CMAKE_CURRENT_BINARY_DIR}/p"
     URL "https://github.com/rhasspy/piper-phonemize/archive/refs/heads/master.zip"
-    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${PIPER_PHONEMIZE_DIR}:ONNXRUNTIME_VERSION=${ONNXRUNTIME_VERSION}
+    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=${PIPER_PHONEMIZE_DIR}
   )
   add_dependencies(piper piper_phonemize_external)
   add_dependencies(test_piper piper_phonemize_external)