diff --git a/includes/RhythmGameUtilities/Utilities.hpp b/includes/RhythmGameUtilities/Utilities.hpp
index ab177a8..abef558 100644
--- a/includes/RhythmGameUtilities/Utilities.hpp
+++ b/includes/RhythmGameUtilities/Utilities.hpp
@@ -76,7 +76,7 @@ GenerateAdjacentKeyPairs(std::map<int, int> keyValuePairs)
 
     std::vector<int> sortedKeys(keys.begin(), keys.end());
 
-    for (auto i = 0; i < size(sortedKeys) - 1; i += 1)
+    for (auto i = 0; i < sortedKeys.size() - 1; i += 1)
     {
         adjacentKeyPairs.push_back(
             std::make_tuple(sortedKeys[i], sortedKeys[i + 1]));
diff --git a/tests/RhythmGameUtilities/UtilitiesInternal.cpp b/tests/RhythmGameUtilities/UtilitiesInternal.cpp
index 82daa35..7d2ccc0 100644
--- a/tests/RhythmGameUtilities/UtilitiesInternal.cpp
+++ b/tests/RhythmGameUtilities/UtilitiesInternal.cpp
@@ -24,7 +24,7 @@ void testConvertSecondsToTicksInternal()
 
     assert(1408 == ConvertSecondsToTicksInternal(5, 192, &bpmChangesKeys[0],
                                                  &bpmChangesValues[0],
-                                                 size(bpmChanges)));
+                                                 bpmChanges.size()));
 
     std::cout << ".";
 }
@@ -48,7 +48,7 @@ void testCalculateBeatBarsInternal()
 
     auto beatBars =
         CalculateBeatBarsInternal(&bpmChangesKeys[0], &bpmChangesValues[0],
-                                  size(bpmChanges), 192, 4, true, outSize);
+                                  bpmChanges.size(), 192, 4, true, outSize);
 
     assert(*outSize == 446);