diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index f0e13862f..619bbe7bc 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -1560,11 +1560,6 @@ if (WIN32 OR APPLE)
         else ()
             set(UHD_PYTHON_ARGS "")
         endif ()
-        if (DEFINED Python3_ROOT_DIR)
-            set(UHD_PYTHON_ARGS "-DPython3_ROOT_DIR=${Python3_ROOT_DIR}")
-        else ()
-            set(UHD_PYTHON_ARGS "")
-        endif ()
         ExternalProject_Add(uhd
                 GIT_REPOSITORY https://github.com/EttusResearch/uhd.git
                 GIT_TAG ${UHD_TAG}