diff --git a/system/devel/flex/actions.py b/system/devel/flex/actions.py
index 963e6df9..e540f7e9 100644
--- a/system/devel/flex/actions.py
+++ b/system/devel/flex/actions.py
@@ -10,6 +10,7 @@ from pisi.actionsapi import shelltools
 from pisi.actionsapi import get
 
 def setup():
+    shelltools.system("sed -i '/math.h/a #include <malloc.h>' src/flexdef.h")
     pisitools.flags.add("-fPIC")
     shelltools.export("AUTOPOINT", "true")