diff --git a/src/pcre2_jit_compile.c b/src/pcre2_jit_compile.c
index 2ca5a26..bf12204 100644
--- a/src/pcre2_jit_compile.c
+++ b/src/pcre2_jit_compile.c
@@ -5995,7 +5995,7 @@ while (*cc != XCL_END)
       OP_FLAGS(SLJIT_MOV, TMP2, 0, SLJIT_UNUSED, 0, SLJIT_LESS_EQUAL);
 
       SET_CHAR_OFFSET(0);
-      OP2(SLJIT_SUB | SLJIT_SET_U, SLJIT_UNUSED, 0, TMP1, 0, SLJIT_IMM, 0xff);
+      OP2(SLJIT_SUB | SLJIT_SET_U, SLJIT_UNUSED, 0, TMP1, 0, SLJIT_IMM, 0x7f);
       OP_FLAGS(SLJIT_AND, TMP2, 0, TMP2, 0, SLJIT_LESS_EQUAL);
 
       SET_TYPE_OFFSET(ucp_Pc);