diff --git a/apps/openmw/mwgui/timeadvancer.cpp b/apps/openmw/mwgui/timeadvancer.cpp
index abe0a668d4..c4bdc030c2 100644
--- a/apps/openmw/mwgui/timeadvancer.cpp
+++ b/apps/openmw/mwgui/timeadvancer.cpp
@@ -1,5 +1,11 @@
 #include "timeadvancer.hpp"
 
+namespace
+{
+    // Time per hour tick
+    constexpr float kProgressStepDelay = 1.0f / 60.0f;
+}
+
 namespace MWGui
 {
     TimeAdvancer::TimeAdvancer()
@@ -7,7 +13,7 @@ namespace MWGui
         , mCurHour(0)
         , mHours(1)
         , mInterruptAt(-1)
-        , mRemainingTime(mDelay)
+        , mRemainingTime(kProgressStepDelay)
     {
     }
 
@@ -16,7 +22,7 @@ namespace MWGui
         mHours = hours;
         mCurHour = 0;
         mInterruptAt = interruptAt;
-        mRemainingTime = mDelay;
+        mRemainingTime = kProgressStepDelay;
 
         mRunning = true;
     }
@@ -42,7 +48,7 @@ namespace MWGui
 
         while (mRemainingTime <= 0)
         {
-            mRemainingTime += mDelay;
+            mRemainingTime += kProgressStepDelay;
             ++mCurHour;
 
             if (mCurHour <= mHours)
diff --git a/apps/openmw/mwgui/timeadvancer.hpp b/apps/openmw/mwgui/timeadvancer.hpp
index be19619d25..e69153aed4 100644
--- a/apps/openmw/mwgui/timeadvancer.hpp
+++ b/apps/openmw/mwgui/timeadvancer.hpp
@@ -32,7 +32,6 @@ namespace MWGui
         int mHours;
         int mInterruptAt;
 
-        static constexpr float mDelay = 1.0f / 60.0f;
         float mRemainingTime;
     };
 }