diff --git a/apps/openmw/mwsound/soundmanagerimp.cpp b/apps/openmw/mwsound/soundmanagerimp.cpp
index a1eb59bac..be7c68e64 100644
--- a/apps/openmw/mwsound/soundmanagerimp.cpp
+++ b/apps/openmw/mwsound/soundmanagerimp.cpp
@@ -32,6 +32,8 @@ namespace MWSound
 {
     namespace
     {
+        constexpr float sMinUpdateInterval = 1.0f / 30.0f;
+
         WaterSoundUpdaterSettings makeWaterSoundUpdaterSettings()
         {
             WaterSoundUpdaterSettings settings;
@@ -885,7 +887,6 @@ namespace MWSound
 
     void SoundManager::updateWaterSound(float /*duration*/)
     {
-        static const ESM::Cell *LastCell;
         MWBase::World* world = MWBase::Environment::get().getWorld();
         const MWWorld::ConstPtr player = world->getPlayerPtr();
         const ESM::Cell *curcell = player.getCell()->getCell();
@@ -903,9 +904,9 @@ namespace MWSound
                 bool soundIdChanged = false;
 
                 Sound_Buffer *sfx = lookupSound(update.mId);
-                if(LastCell != curcell)
+                if (mLastCell != curcell)
                 {
-                    LastCell = curcell;
+                    mLastCell = curcell;
                     SoundMap::const_iterator snditer = mActiveSounds.find(MWWorld::Ptr());
                     if(snditer != mActiveSounds.end())
                     {
@@ -930,7 +931,7 @@ namespace MWSound
         }
         else if (update.mVolume > 0.0f)
         {
-            LastCell = curcell;
+            mLastCell = curcell;
             mNearWaterSound = playSound(update.mId, update.mVolume, 1.0f, Type::Sfx, PlayMode::Loop);
         }
     }
@@ -946,13 +947,11 @@ namespace MWSound
             mSaySoundsQueue.erase(queuesayiter++);
         }
 
-        static float timePassed = 0.0;
-
-        timePassed += duration;
-        if(timePassed < (1.0f/30.0f))
+        mTimePassed += duration;
+        if (mTimePassed < sMinUpdateInterval)
             return;
-        duration = timePassed;
-        timePassed = 0.0f;
+        duration = mTimePassed;
+        mTimePassed = 0.0f;
 
         // Make sure music is still playing
         if(!isMusicPlaying() && !mCurrentPlaylist.empty())
diff --git a/apps/openmw/mwsound/soundmanagerimp.hpp b/apps/openmw/mwsound/soundmanagerimp.hpp
index c79f9abe5..85aa0a386 100644
--- a/apps/openmw/mwsound/soundmanagerimp.hpp
+++ b/apps/openmw/mwsound/soundmanagerimp.hpp
@@ -27,6 +27,7 @@ namespace VFS
 namespace ESM
 {
     struct Sound;
+    struct Cell;
 }
 
 namespace MWSound
@@ -114,6 +115,10 @@ namespace MWSound
 
         RegionSoundSelector mRegionSoundSelector;
 
+        float mTimePassed = 0;
+
+        const ESM::Cell *mLastCell = nullptr;
+
         Sound_Buffer *insertSound(const std::string &soundId, const ESM::Sound *sound);
 
         Sound_Buffer *lookupSound(const std::string &soundId) const;