diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp
index 5492887..4daab49 100644
--- a/lib/MC/ELFObjectWriter.cpp
+++ b/lib/MC/ELFObjectWriter.cpp
@@ -1546,6 +1546,7 @@
     case ARM::fixup_arm_ldst_pcrel_12:
     case ARM::fixup_arm_pcrel_10:
     case ARM::fixup_arm_adr_pcrel_12:
+    case ARM::fixup_arm_thumb_bl:
       assert(0 && "Unimplemented"); break;
     case ARM::fixup_arm_branch:
       return ELF::R_ARM_CALL; break;