diff --git a/asm/6502/decompress_v1.asm b/asm/6502/decompress_v1.asm
index bbb559d..be84e88 100755
--- a/asm/6502/decompress_v1.asm
+++ b/asm/6502/decompress_v1.asm
@@ -62,6 +62,7 @@ LARGE_VARLEN_LITERALS                   ; handle 16 bits literals count
    BYTE $A9                             ; mask TAX (faster than BCS)
 PREPARE_COPY_LITERALS
    TAX
+   BEQ COPY_LITERALS
    INY
 
 COPY_LITERALS
@@ -89,6 +90,8 @@ SHORT_VARLEN_MATCHLEN
 PREPARE_COPY_MATCH
    TAX
 PREPARE_COPY_MATCH_Y
+   TXA
+   BEQ COPY_MATCH_LOOP
    INY
 
 COPY_MATCH_LOOP
diff --git a/asm/6502/decompress_v2.asm b/asm/6502/decompress_v2.asm
index dd14c11..9bd7942 100755
--- a/asm/6502/decompress_v2.asm
+++ b/asm/6502/decompress_v2.asm
@@ -68,6 +68,8 @@ PREPARE_COPY_LITERALS
    TAY                                  ; put high 8 bits in Y
 
 PREPARE_COPY_LITERALS_HIGH
+   TXA
+   BEQ COPY_LITERALS
    INY
 
 COPY_LITERALS
@@ -165,6 +167,8 @@ PREPARE_COPY_MATCH
    TAY                                  ; put high 8 bits in Y
 
 PREPARE_COPY_MATCH_Y
+   TXA
+   BEQ COPY_MATCH_LOOP
    INY
 
 COPY_MATCH_LOOP