diff --git a/Makefile.am b/Makefile.am
index a4dd7b8..099a3c1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -53,7 +53,7 @@ endif
 # foo/__init__.py into an (older) version with plain foo.py, since
 # foo/__init__.pyc will cause Python to ignore foo.py.
 run_python = \
-	PYTHONPATH=$(top_srcdir)/python$(psep)$$PYTHONPATH \
+	PYTHONPATH=$(top_srcdir)/python$(psep)$(PYTHONPATH) \
 	PYTHONDONTWRITEBYTECODE=yes $(PYTHON)
 
 ALL_LOCAL =
diff --git a/Makefile.in b/Makefile.in
index 8df66e2..98b54bf 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1654,7 +1654,7 @@ AM_CFLAGS = -Wstrict-prototypes $(WARNING_FLAGS) $(OVS_CFLAGS) \
 # foo/__init__.py into an (older) version with plain foo.py, since
 # foo/__init__.pyc will cause Python to ignore foo.py.
 run_python = \
-	PYTHONPATH=$(top_srcdir)/python$(psep)$$PYTHONPATH \
+	PYTHONPATH=$(top_srcdir)/python$(psep)$(PYTHONPATH) \
 	PYTHONDONTWRITEBYTECODE=yes $(PYTHON)