diff --git a/galpy/actionAngle_src/actionAngle_c_ext/actionAngleStaeckel.c b/galpy/actionAngle_src/actionAngle_c_ext/actionAngleStaeckel.c
index bd715110f..675e419d4 100644
--- a/galpy/actionAngle_src/actionAngle_c_ext/actionAngleStaeckel.c
+++ b/galpy/actionAngle_src/actionAngle_c_ext/actionAngleStaeckel.c
@@ -950,6 +950,7 @@ void actionAngleStaeckel_actionsFreqsAngles(int ndata,
   free(detA);
   free(dI3dJR);
   free(dI3dJz);
+  free(dI3dLz);
 }
 void calcFreqsFromDerivsStaeckel(int ndata,
 				 double * Omegar,