diff --git a/dix/ptrveloc.c b/dix/ptrveloc.c
index ed80af5d7..ccd445e86 100644
--- a/dix/ptrveloc.c
+++ b/dix/ptrveloc.c
@@ -1072,7 +1072,7 @@ void
 acceleratePointerPredictable(
     DeviceIntPtr dev,
     ValuatorMask* val,
-    int evtime)
+    CARD32 evtime)
 {
     float fdx, fdy, tmp, mult; /* no need to init */
     int dx = 0, dy = 0, tmpi;
@@ -1151,7 +1151,7 @@ void
 acceleratePointerLightweight(
     DeviceIntPtr dev,
     ValuatorMask* val,
-    int ignored)
+    CARD32 ignored)
 {
     float mult = 0.0, tmpf;
     int dx = 0, dy = 0, tmpi;
diff --git a/include/input.h b/include/input.h
index 165992a23..bdef0389e 100644
--- a/include/input.h
+++ b/include/input.h
@@ -145,7 +145,7 @@ typedef void (*DeviceUnwrapProc)(
 typedef void (*PointerAccelSchemeProc)(
     DeviceIntPtr /*device*/,
     ValuatorMask* /*valuators*/,
-    int /*evtime*/);
+    CARD32 /*evtime*/);
 
 typedef void (*DeviceCallbackProc)(
               DeviceIntPtr /*pDev*/);
diff --git a/include/ptrveloc.h b/include/ptrveloc.h
index a1165b156..c14e12d61 100644
--- a/include/ptrveloc.h
+++ b/include/ptrveloc.h
@@ -134,9 +134,11 @@ InitPredictableAccelerationScheme(DeviceIntPtr dev,
 				  struct _ValuatorAccelerationRec* protoScheme);
 
 extern _X_INTERNAL void
-acceleratePointerPredictable(DeviceIntPtr dev, ValuatorMask* val, int evtime);
+acceleratePointerPredictable(DeviceIntPtr dev, ValuatorMask* val,
+                             CARD32 evtime);
 
 extern _X_INTERNAL void
-acceleratePointerLightweight(DeviceIntPtr dev, ValuatorMask* val, int evtime);
+acceleratePointerLightweight(DeviceIntPtr dev, ValuatorMask* val,
+                             CARD32 evtime);
 
 #endif  /* POINTERVELOCITY_H */