diff --git a/scripts/update-generated-code.sh b/scripts/update-generated-code.sh
index 4172d4e..a301aec 100755
--- a/scripts/update-generated-code.sh
+++ b/scripts/update-generated-code.sh
@@ -1,13 +1,13 @@
 #!/bin/bash
 
 # make audio ports constant, they must never change
-sed -i "/^int gen_kernel_numins = /{s/^/const /}" plugins/*/gen_exported.cpp
-sed -i "/^int gen_kernel_numouts = /{s/^/const /}" plugins/*/gen_exported.cpp
+sed -i -e "/^int gen_kernel_numins = /{s/^/const /}" plugins/*/gen_exported.cpp
+sed -i -e "/^int gen_kernel_numouts = /{s/^/const /}" plugins/*/gen_exported.cpp
 
 # change prototype of param functions, no doubles!
-sed -i "s/setparameter(CommonState *cself, long index, double value, void *ref)/setparameter(CommonState *cself, long index, t_param value, void *ref)/" plugins/*/gen_exported.cpp plugins/*/gen_exported.h
-sed -i "s/getparameter(CommonState *cself, long index, double *value)/getparameter(CommonState *cself, long index, t_param *value)/" plugins/*/gen_exported.cpp plugins/*/gen_exported.h
-sed -i "s/create(double sr, long vs)/create(t_param sr, long vs)/" plugins/*/gen_exported.cpp plugins/*/gen_exported.h
+sed -i -e "s/long index, double value,/long index, t_param value,/" plugins/*/gen_exported.cpp plugins/*/gen_exported.h
+sed -i -e "s/long index, double \*value/long index, t_param \*value/" plugins/*/gen_exported.cpp plugins/*/gen_exported.h
+sed -i -e "s/create(double sr, long vs)/create(t_param sr, long vs)/" plugins/*/gen_exported.cpp plugins/*/gen_exported.h
 
 # use t_sample instead of forcing doubles
-sed -i "s/double /t_sample /" plugins/*/gen_exported.cpp
+sed -i -e "s/double /t_sample /" plugins/*/gen_exported.cpp