diff --git a/src/octreelsf_shrink_xyz.f90 b/src/octreelsf_shrink_xyz.f90
index abdc3ec5575ed9d4d6cd4e533fc08fcd7a9ca011..cf1822028042d182b0bb42f6472f8886f637226e 100644
--- a/src/octreelsf_shrink_xyz.f90
+++ b/src/octreelsf_shrink_xyz.f90
@@ -15,6 +15,7 @@ implicit none
 
 ! parameters, in
 type (thread) threadinfo
+type (parameters) params
 
 ! parameters, in/out
 type (octreelsf) os