diff --git a/minix/servers/vm/mem_anon_contig.c b/minix/servers/vm/mem_anon_contig.c
index d2f063df1..76fb3dc52 100644
--- a/minix/servers/vm/mem_anon_contig.c
+++ b/minix/servers/vm/mem_anon_contig.c
@@ -15,6 +15,8 @@ static int anon_contig_pagefault(struct vmproc *vmp, struct vir_region *region,
 	int len, int *io);
 static int anon_contig_sanitycheck(struct phys_region *pr, const char *file, int line);
 static int anon_contig_writable(struct phys_region *pr);
+static void anon_contig_split(struct vmproc *vmp, struct vir_region *vr,
+                        struct vir_region *r1, struct vir_region *r2);
 static int anon_contig_resize(struct vmproc *vmp, struct vir_region *vr, vir_bytes l);
 static int anon_contig_new(struct vir_region *vr);
 static int anon_contig_pt_flags(struct vir_region *vr);
@@ -26,6 +28,7 @@ struct mem_type mem_type_anon_contig = {
 	.ev_unreference = anon_contig_unreference,
 	.ev_pagefault = anon_contig_pagefault,
 	.ev_resize = anon_contig_resize,
+	.ev_split = anon_contig_split,
 	.ev_sanitycheck = anon_contig_sanitycheck,
 	.writable = anon_contig_writable,
 	.pt_flags = anon_contig_pt_flags,
@@ -121,3 +124,9 @@ static int anon_contig_writable(struct phys_region *pr)
 	return mem_type_anon.writable(pr);
 }
 
+static void anon_contig_split(struct vmproc *vmp, struct vir_region *vr,
+                        struct vir_region *r1, struct vir_region *r2)
+{
+	return;
+}
+
diff --git a/minix/servers/vm/region.c b/minix/servers/vm/region.c
index 507407d67..881488d72 100644
--- a/minix/servers/vm/region.c
+++ b/minix/servers/vm/region.c
@@ -1160,6 +1160,7 @@ static int split_region(struct vmproc *vmp, struct vir_region *vr,
 	if(!vr->def_memtype->ev_split) {
 		printf("VM: split region not implemented for %s\n",
 			vr->def_memtype->name);
+		sys_diagctl_stacktrace(vmp->vm_endpoint);
 		return EINVAL;
 	}