diff --git a/inc/python b/inc/python
index 1c581ba..0860563 100644
--- a/inc/python
+++ b/inc/python
@@ -399,6 +399,16 @@
 function setup_dev_lib {
     local name=$1
     local dir=${GITDIR[$name]}
+    if python3_enabled; then
+        # Turn off Python 3 mode and install the package again,
+        # forcing a Python 2 installation. This ensures that all libs
+        # being used for development are installed under both versions
+        # of Python.
+        echo "Installing $name again without Python 3 enabled"
+        USE_PYTHON3=False
+        setup_develop $dir
+        USE_PYTHON3=True
+    fi
     setup_develop $dir
 }