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-rw-r--r--include/ap_config.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ap_config.h b/include/ap_config.h
index 68a3d14c85..ebb8cf7c83 100644
--- a/include/ap_config.h
+++ b/include/ap_config.h
@@ -194,7 +194,7 @@
#define AP_NONBLOCK_WHEN_MULTI_LISTEN 1
#endif
-#if AP_ENABLE_DTRACE && HAVE_SYS_SDT_H
+#if defined(AP_ENABLE_DTRACE) && HAVE_SYS_SDT_H
#include <sys/sdt.h>
#else
#undef _DTRACE_VERSION