diff --git a/decode.c b/decode.c
index 91b09f4..099284c 100644
--- a/decode.c
+++ b/decode.c
@@ -517,7 +517,7 @@ fd_decode(const uint8_t* buffer, size_t len_sz, int mode_int, uintptr_t address,
         uint8_t imm_size;
         if (DESC_IMM_BYTE(desc))
             imm_size = 1;
-        else if (UNLIKELY(instr->type == FDI_RET_IMM))
+        else if (UNLIKELY(instr->type == FDI_RET_IMM || instr->type == FDI_RETF))
             imm_size = 2;
         else if (UNLIKELY(instr->type == FDI_ENTER))
             imm_size = 3;
diff --git a/instrs.txt b/instrs.txt
index b8dab26..37bea62 100644
--- a/instrs.txt
+++ b/instrs.txt
@@ -203,8 +203,9 @@ c7//f8                D     IMM    -      -      -      XBEGIN
 # ENTER immediate handled in code
 c8                    I     IMM32  -      -      -      ENTER DEF64 INSTR_WIDTH
 c9                    NP    -      -      -      -      LEAVE DEF64 INSTR_WIDTH
-#ca RETf TODO, ONLY32
-#cb RETf TODO, ONLY32
+# RETF immediate size handled in code
+ca                    I     IMM16  -      -      -      RETF DEF64 INSTR_WIDTH
+cb                    NP    -      -      -      -      RETF DEF64 INSTR_WIDTH
 cc                    NP    -      -      -      -      INT3
 cd                    I     IMM8   -      -      -      INT IMM_8
 ce                    NP    -      -      -      -      INTO ONLY32