diff --git a/layout/base/MobileViewportManager.cpp b/layout/base/MobileViewportManager.cpp
index a18dd8597ff5..97c70ad677a4 100644
--- a/layout/base/MobileViewportManager.cpp
+++ b/layout/base/MobileViewportManager.cpp
@@ -178,15 +178,6 @@ CSSToScreenScale MobileViewportManager::ClampZoom(
     zoom = aViewportInfo.GetMaxZoom();
     MVM_LOG("%p: Clamped to %f\n", this, zoom.scale);
   }
-
-  // Non-positive zoom factors can produce NaN or negative viewport sizes,
-  // so we better be sure we've got a positive zoom factor. Just for good
-  // measure, we check our min/max as well as the final clamped value.
-  MOZ_ASSERT(aViewportInfo.GetMinZoom() > CSSToScreenScale(0.0f),
-             "zoom factor must be positive");
-  MOZ_ASSERT(aViewportInfo.GetMaxZoom() > CSSToScreenScale(0.0f),
-             "zoom factor must be positive");
-  MOZ_ASSERT(zoom > CSSToScreenScale(0.0f), "zoom factor must be positive");
   return zoom;
 }