diff --git a/linker/debugger.cpp b/linker/debugger.cpp
index c947522..29afab1 100644
--- a/linker/debugger.cpp
+++ b/linker/debugger.cpp
@@ -235,7 +235,7 @@
         case SIGABRT:
         case SIGFPE:
         case SIGPIPE:
-#ifdef SIGSTKFLT
+#if defined(SIGSTKFLT)
         case SIGSTKFLT:
 #endif
             (void) tgkill(getpid(), gettid(), n);