diff --git a/gprMax/geometry_outputs_ext.pyx b/gprMax/geometry_outputs_ext.pyx
index 354153bb..21490909 100644
--- a/gprMax/geometry_outputs_ext.pyx
+++ b/gprMax/geometry_outputs_ext.pyx
@@ -18,8 +18,6 @@
 
 cimport numpy as np
 
-from gprMax.constants cimport floattype_t
-
 
 cpdef void define_fine_geometry(
                     int nx,
@@ -35,7 +33,7 @@ cpdef void define_fine_geometry(
                     float dy,
                     float dz,
                     np.uint32_t[:, :, :, :] ID,
-                    floattype_t[:, :] points,
+                    np.float32_t[:, :] points,
                     np.uint32_t[:, :] x_lines,
                     np.uint32_t[:] x_materials,
                     np.uint32_t[:, :] y_lines,