diff --git a/include/eventconvert.h b/include/eventconvert.h
index dc3fd736d..277a6c4b8 100644
--- a/include/eventconvert.h
+++ b/include/eventconvert.h
@@ -28,7 +28,7 @@
 #include "input.h"
 #include "events.h"
 
-#define FP1616(integral, frac) (integral * (1 << 16) + frac * (1 << 16))
+#define FP1616(integral, frac) ((integral) * (1 << 16) + (frac) * (1 << 16))
 
 _X_INTERNAL int EventToCore(InternalEvent *event, xEvent *core);
 _X_INTERNAL int EventToXI(InternalEvent *ev, xEvent **xi, int *count);