diff --git a/libs/libc/machine/sim/arch_elf.c b/libs/libc/machine/sim/arch_elf.c
index 3d0f167eb00..fc18a79b94b 100644
--- a/libs/libc/machine/sim/arch_elf.c
+++ b/libs/libc/machine/sim/arch_elf.c
@@ -127,6 +127,7 @@ int up_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
        break;
 
      default:
+       berr("ERROR: Unsupported type %u\n", ELF32_R_TYPE(rel->r_info));
        return -EINVAL;
     }