diff --git a/macaw-aarch32/src/Data/Macaw/ARM/Disassemble.hs b/macaw-aarch32/src/Data/Macaw/ARM/Disassemble.hs
index f760da5e..25890eca 100644
--- a/macaw-aarch32/src/Data/Macaw/ARM/Disassemble.hs
+++ b/macaw-aarch32/src/Data/Macaw/ARM/Disassemble.hs
@@ -331,7 +331,6 @@ data TranslationError w = TranslationError { transErrorAddr :: MM.MemSegmentOff
 data TranslationErrorReason w = InvalidNextPC (MM.MemAddr w) (MM.MemAddr w)
                               | DecodeError (ARMMemoryError w)
                               | UnsupportedInstruction InstructionSet
-                              | InstructionAtUnmappedAddr InstructionSet
                               | GenerationError InstructionSet SG.GeneratorError
                               deriving (Show)
 
diff --git a/macaw-ppc/src/Data/Macaw/PPC/Disassemble.hs b/macaw-ppc/src/Data/Macaw/PPC/Disassemble.hs
index ecddd14d..d0da8a76 100644
--- a/macaw-ppc/src/Data/Macaw/PPC/Disassemble.hs
+++ b/macaw-ppc/src/Data/Macaw/PPC/Disassemble.hs
@@ -252,7 +252,6 @@ data TranslationError w = TranslationError { transErrorAddr :: MM.MemSegmentOff
 data TranslationErrorReason w = InvalidNextIP Word64 Word64
                               | DecodeError (PPCMemoryError w)
                               | UnsupportedInstruction D.Instruction
-                              | InstructionAtUnmappedAddr D.Instruction
                               | GenerationError D.Instruction GeneratorError
                               deriving (Show)