diff --git a/lib/geometry/geo_surface.cpp b/lib/geometry/geo_surface.cpp
index d46900c25..7fdeff165 100644
--- a/lib/geometry/geo_surface.cpp
+++ b/lib/geometry/geo_surface.cpp
@@ -142,12 +142,6 @@ void geo_surface_fprintf_irap(const geo_surface_type *surface,
     geo_surface_fprintf_irap__(surface, filename, zcoord);
 }
 
-void geo_surface_fprintf_irap_external_zcoord(const geo_surface_type *surface,
-                                              const char *filename,
-                                              const double *zcoord) {
-    geo_surface_fprintf_irap__(surface, filename, zcoord);
-}
-
 geo_surface_type *geo_surface_alloc_new(int nx, int ny, double xinc,
                                         double yinc, double xstart,
                                         double ystart, double angle) {
@@ -312,11 +306,6 @@ void geo_surface_free(geo_surface_type *surface) {
     free(surface);
 }
 
-void geo_surface_free__(void *arg) {
-    geo_surface_type *surface = geo_surface_safe_cast(arg);
-    geo_surface_free(surface);
-}
-
 geo_pointset_type *geo_surface_get_pointset(const geo_surface_type *surface) {
     return surface->pointset;
 }
diff --git a/lib/include/ert/geometry/geo_surface.hpp b/lib/include/ert/geometry/geo_surface.hpp
index 86380ce73..af5d211b4 100644
--- a/lib/include/ert/geometry/geo_surface.hpp
+++ b/lib/include/ert/geometry/geo_surface.hpp
@@ -14,7 +14,6 @@ bool geo_surface_equal_header(const geo_surface_type *surface1,
 bool geo_surface_equal(const geo_surface_type *surface1,
                        const geo_surface_type *surface2);
 void geo_surface_free(geo_surface_type *geo_surface);
-void geo_surface_free__(void *arg);
 geo_pointset_type *geo_surface_get_pointset(const geo_surface_type *surface);
 geo_surface_type *geo_surface_fload_alloc_irap(const char *filename,
                                                bool loadz);
@@ -27,9 +26,6 @@ double geo_surface_iget_zvalue(const geo_surface_type *surface, int index);
 int geo_surface_get_size(const geo_surface_type *surface);
 void geo_surface_fprintf_irap(const geo_surface_type *surface,
                               const char *filename);
-void geo_surface_fprintf_irap_external_zcoord(const geo_surface_type *surface,
-                                              const char *filename,
-                                              const double *zcoord);
 int geo_surface_get_nx(const geo_surface_type *surface);
 int geo_surface_get_ny(const geo_surface_type *surface);
 void geo_surface_iget_xy(const geo_surface_type *surface, int index, double *x,