diff --git a/internal/atlas/image.go b/internal/atlas/image.go
index b16f1d500..be134b5e8 100644
--- a/internal/atlas/image.go
+++ b/internal/atlas/image.go
@@ -81,6 +81,7 @@ func (t *temporaryPixels) resetAtFrameEnd() {
 	// Let the pixels GCed if this is not used for a while.
 	if t.notFullyUsedTime == maxNotFullyUsedTime && len(t.pixels) > 0 {
 		t.pixels = nil
+		t.notFullyUsedTime = 0
 	}
 
 	// Reset the position and reuse the allocated bytes.
diff --git a/internal/graphics/vertex.go b/internal/graphics/vertex.go
index 06ccc3274..8ea28fa5f 100644
--- a/internal/graphics/vertex.go
+++ b/internal/graphics/vertex.go
@@ -108,6 +108,7 @@ func (v *verticesBackend) lockAndReset(f func() error) error {
 
 	if v.notFullyUsedTime == maxNotFullyUsedTime && len(v.backend) > 0 {
 		v.backend = nil
+		v.notFullyUsedTime = 0
 	}
 
 	v.pos = 0