diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index a8513dc..ad15e0f 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -37,6 +37,11 @@ target_link_libraries( tbeyn3a_implus qpms gsl lapacke amos m )
 target_include_directories( tbeyn3a_implus PRIVATE .. )
 target_compile_definitions( tbeyn3a_implus PRIVATE VARIANTA IMPLUS )
 
+add_executable( tbeyn3a_kidney tbeyn3.c )
+target_link_libraries( tbeyn3a_kidney qpms gsl lapacke amos m )
+target_include_directories( tbeyn3a_kidney PRIVATE .. )
+target_compile_definitions( tbeyn3a_kidney PRIVATE VARIANTA IMPLUS_KIDNEY )
+
 add_executable( tbeyn3b tbeyn3.c )
 target_link_libraries( tbeyn3b qpms gsl lapacke amos m )
 target_include_directories( tbeyn3b PRIVATE .. )
diff --git a/tests/tbeyn3.c b/tests/tbeyn3.c
index fd0260e..52ede9a 100644
--- a/tests/tbeyn3.c
+++ b/tests/tbeyn3.c
@@ -64,6 +64,8 @@ int main(int argc, char **argv) {
   if (argc > 2) L = atoi(argv[2]);
 #ifdef IMPLUS
   beyn_contour_t *contour = beyn_contour_halfellipse(z0, Rx, Ry, N, BEYN_CONTOUR_HALFELLIPSE_IM_PLUS);
+#elif defined IMPLUS_KIDNEY
+  beyn_contour_t *contour = beyn_contour_kidney(z0, Rx, Ry, 0.3, N, BEYN_CONTOUR_HALFELLIPSE_IM_PLUS);
 #else
   beyn_contour_t *contour = beyn_contour_ellipse(z0, Rx, Ry, N);
 #endif