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-rw-r--r--rts/Libdw.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/rts/Libdw.c b/rts/Libdw.c
index a16ea59fb5..33a40a1f37 100644
--- a/rts/Libdw.c
+++ b/rts/Libdw.c
@@ -281,7 +281,7 @@ static bool memory_read(Dwfl *dwfl STG_UNUSED, Dwarf_Addr addr,
static bool set_initial_registers(Dwfl_Thread *thread, void *arg);
-#ifdef x86_64_HOST_ARCH
+#if defined(x86_64_HOST_ARCH)
static bool set_initial_registers(Dwfl_Thread *thread,
void *arg STG_UNUSED) {
Dwarf_Word regs[17];