[core] use unique IDs for DrawScopes

2 files changed, 3 insertions, 3 deletions

diff --git a/src/mbgl/programs/gl/shaders.cpp b/src/mbgl/programs/gl/shaders.cpp
index 6fb4d70db9..e8c9bdfc3c 100644
--- a/src/mbgl/programs/gl/shaders.cpp
+++ b/src/mbgl/programs/gl/shaders.cpp
@@ -16,8 +16,8 @@ std::string programIdentifier(const std::string& defines1,
                               const uint8_t hash2[8]) {
     std::string result;
     result.reserve(8 + 8 + (sizeof(size_t) * 2) * 2 + 2);
-    result.append(util::toHex(std::hash<std::string>()(defines1)));
-    result.append(util::toHex(std::hash<std::string>()(defines2)));
+    result.append(util::toHex(static_cast<uint64_t>(std::hash<std::string>()(defines1))));
+    result.append(util::toHex(static_cast<uint64_t>(std::hash<std::string>()(defines2))));
     result.append(hash1, hash2 + 8);
     result.append(hash2, hash2 + 8);
     result.append("v3");
diff --git a/src/mbgl/programs/program_parameters.cpp b/src/mbgl/programs/program_parameters.cpp
index e692b74e0e..a49dc2bc88 100644
--- a/src/mbgl/programs/program_parameters.cpp
+++ b/src/mbgl/programs/program_parameters.cpp
@@ -34,7 +34,7 @@ optional<std::string> ProgramParameters::cachePath(const char* name) const {
         result += "/com.mapbox.gl.shader.";
         result += name;
         result += '.';
-        result += util::toHex(std::hash<std::string>()(defines));
+        result += util::toHex(static_cast<uint64_t>(std::hash<std::string>()(defines)));
         result += ".pbf";
         return result;
     }