diff --git a/src/llvm_backend_proc.cpp b/src/llvm_backend_proc.cpp
index c41430df7..89a59de62 100644
--- a/src/llvm_backend_proc.cpp
+++ b/src/llvm_backend_proc.cpp
@@ -2947,7 +2947,7 @@ gb_internal lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValu
 					LLVMValueRef the_asm = llvm_get_inline_asm(
 						func_type,
 						str_lit("rolq $$3, %rdi; rolq $$13, %rdi\n rolq $$61, %rdi; rolq $$51, %rdi\n xchgq %rbx, %rbx"),
-						str_lit("={rdx},{rdx},{rax},cc,memory"),
+						str_lit("={rdx},{rdx},{rax},~{cc},~{memory}"),
 						true
 					);