diff --git a/src/mbgl/annotation/sprite_image.cpp b/src/mbgl/annotation/sprite_image.cpp
index 9cfe9c9fc..1a5ae8e09 100644
--- a/src/mbgl/annotation/sprite_image.cpp
+++ b/src/mbgl/annotation/sprite_image.cpp
@@ -8,13 +8,13 @@ namespace mbgl {
 
 SpriteImage::SpriteImage(const uint16_t width_,
                          const uint16_t height_,
-                         const float ratio_,
+                         const float pixelRatio_,
                          std::string&& data_)
     : width(width_),
       height(height_),
-      ratio(ratio_),
-      pixelWidth(std::ceil(width * ratio)),
-      pixelHeight(std::ceil(height * ratio)),
+      pixelRatio(pixelRatio_),
+      pixelWidth(std::ceil(width * pixelRatio)),
+      pixelHeight(std::ceil(height * pixelRatio)),
       data(std::move(data_)) {
     const size_t size = pixelWidth * pixelHeight * 4;
     if (size == 0) {
diff --git a/src/mbgl/annotation/sprite_image.hpp b/src/mbgl/annotation/sprite_image.hpp
index 2d0ac920a..19de77c0c 100644
--- a/src/mbgl/annotation/sprite_image.hpp
+++ b/src/mbgl/annotation/sprite_image.hpp
@@ -12,14 +12,14 @@ namespace mbgl {
 
 class SpriteImage : private util::noncopyable {
 public:
-    SpriteImage(uint16_t width, uint16_t height, float ratio, std::string&& data);
+    SpriteImage(uint16_t width, uint16_t height, float pixelRatio, std::string&& data);
 
     // Logical dimensions of the sprite image.
     const uint16_t width;
     const uint16_t height;
 
     // Pixel ratio of the sprite image.
-    const float ratio;
+    const float pixelRatio;
 
     // Physical dimensions of the sprite image.
     const uint16_t pixelWidth;
diff --git a/src/mbgl/annotation/sprite_store.cpp b/src/mbgl/annotation/sprite_store.cpp
index 733d2c7b4..37acace87 100644
--- a/src/mbgl/annotation/sprite_store.cpp
+++ b/src/mbgl/annotation/sprite_store.cpp
@@ -4,11 +4,11 @@
 
 namespace mbgl {
 
-SpriteStore::SpriteStore(const float ratio_) : ratio(ratio_) {
+SpriteStore::SpriteStore(const float pixelRatio_) : pixelRatio(pixelRatio_) {
 }
 
 void SpriteStore::setSprite(const std::string& name, std::shared_ptr<const SpriteImage> sprite) {
-    if (sprite && sprite->ratio != ratio) {
+    if (sprite && sprite->pixelRatio != pixelRatio) {
         throw util::SpriteImageException("Sprite image has wrong pixel ratio");
     }
     std::lock_guard<std::mutex> lock(mutex);
diff --git a/src/mbgl/annotation/sprite_store.hpp b/src/mbgl/annotation/sprite_store.hpp
index 3e81a4daf..d8c8372f9 100644
--- a/src/mbgl/annotation/sprite_store.hpp
+++ b/src/mbgl/annotation/sprite_store.hpp
@@ -34,9 +34,10 @@ public:
     // Returns Sprite images that changed since the last invocation of this function.
     Sprites getDirty();
 
-private:
-    const float ratio;
+    // Pixel ratio of all sprite images in this storage object.
+    const float pixelRatio;
 
+private:
     // Lock for sprites and dirty maps.
     std::mutex mutex;
 
diff --git a/test/annotations/sprite_image.cpp b/test/annotations/sprite_image.cpp
index 30542778f..9c5ca79ac 100644
--- a/test/annotations/sprite_image.cpp
+++ b/test/annotations/sprite_image.cpp
@@ -48,7 +48,7 @@ TEST(Annotations, SpriteImage) {
     EXPECT_EQ(32, sprite.pixelWidth);
     EXPECT_EQ(12, sprite.height);
     EXPECT_EQ(24, sprite.pixelHeight);
-    EXPECT_EQ(2, sprite.ratio);
+    EXPECT_EQ(2, sprite.pixelRatio);
     EXPECT_EQ(32u * 24 * 4, sprite.data.size());
 }
 
@@ -59,6 +59,6 @@ TEST(Annotations, SpriteImageFractionalRatio) {
     EXPECT_EQ(20, sprite.pixelWidth);
     EXPECT_EQ(8, sprite.height);
     EXPECT_EQ(12, sprite.pixelHeight);
-    EXPECT_EQ(1.5, sprite.ratio);
+    EXPECT_EQ(1.5, sprite.pixelRatio);
     EXPECT_EQ(20u * 12 * 4, sprite.data.size());
 }