diff --git a/src/libsysprof-ui/sysprof-visualizer-list.c b/src/libsysprof-ui/sysprof-visualizer-list.c
index 67c131cd..94b2209b 100644
--- a/src/libsysprof-ui/sysprof-visualizer-list.c
+++ b/src/libsysprof-ui/sysprof-visualizer-list.c
@@ -31,8 +31,6 @@
 #include "sysprof-mark-visualizer-row.h"
 #include "sysprof-zoom-manager.h"
 
-#define NSEC_PER_SEC G_GUINT64_CONSTANT(1000000000)
-
 typedef struct
 {
   SysprofCaptureReader *reader;