diff --git a/src/asm/parser.y b/src/asm/parser.y
index 275e4585..f5ee2437 100644
--- a/src/asm/parser.y
+++ b/src/asm/parser.y
@@ -1623,7 +1623,7 @@ string_literal:
 	| OP_STRSLICE LPAREN string COMMA iconst RPAREN {
 		size_t len = strlenUTF8($3, false);
 		uint32_t start = adjustNegativeIndex($5, len, "STRSLICE");
-		$$ = strsliceUTF8($3, start, len - 1);
+		$$ = strsliceUTF8($3, start, len);
 	}
 	| OP_STRSUB LPAREN string COMMA iconst COMMA uconst RPAREN {
 		size_t len = strlenUTF8($3, false);
diff --git a/test/asm/strslice-strsub.out b/test/asm/strslice-strsub.out
index 2c814f42..d0e95f19 100644
--- a/test/asm/strslice-strsub.out
+++ b/test/asm/strslice-strsub.out
@@ -5,10 +5,10 @@ STRSLICE("ABC",-3,-2): A
 STRSLICE("ABC",-2,-1): B
 STRSLICE("ABC",-1,-0): 
 STRSLICE("ABC",-1,3): C
-STRSLICE("ABC",1): B
-STRSLICE("ABC",-2): B
+STRSLICE("ABC",1): BC
+STRSLICE("ABC",-2): BC
 STRSLICE("ABC",4): 
-STRSLICE("ABC",-4): AB
+STRSLICE("ABC",-4): ABC
 STRSLICE("ABC",0,2): AB
 STRSLICE("ABC",1,3): BC
 STRSLICE("ABC",1,31): BC