diff --git a/modules/mixer/simple/Makefile.am b/modules/mixer/simple/Makefile.am
index 38f106c0..1ab8c2e6 100644
--- a/modules/mixer/simple/Makefile.am
+++ b/modules/mixer/simple/Makefile.am
@@ -31,6 +31,6 @@ smixer_hda_la_LIBADD = ../../../src/libasound.la
 if BUILD_PYTHON
 smixer_python_la_SOURCES = python.c
 smixer_python_la_LDFLAGS = -module -avoid-version $(pythonlibs)
-smixer_python_la_CFLAGS = -I$(pythonincdir)
+smixer_python_la_CFLAGS = $(pythonincdir)
 smixer_python_la_LIBADD = ../../../src/libasound.la
 endif