diff --git a/arch/AArch64/AArch64Mapping.c b/arch/AArch64/AArch64Mapping.c
index 0577dd6..58c14ef 100644
--- a/arch/AArch64/AArch64Mapping.c
+++ b/arch/AArch64/AArch64Mapping.c
@@ -329,7 +329,7 @@
 			insn->detail->regs_write_count = (uint8_t)count_positive(insns[i].regs_mod);
 
 			memcpy(insn->detail->groups, insns[i].groups, sizeof(insns[i].groups));
-			insn->detail->groups_count = (uint8_t)count_positive(insns[i].groups);
+			insn->detail->groups_count = (uint8_t)count_positive8(insns[i].groups);
 
 			insn->detail->arm64.update_flags = cs_reg_write((csh)&handle, insn, ARM64_REG_NZCV);
 #endif