diff --git a/source/blood/src/actor.h b/source/blood/src/actor.h
index a08e2d2f9..04ce1676c 100644
--- a/source/blood/src/actor.h
+++ b/source/blood/src/actor.h
@@ -204,14 +204,14 @@ extern short gAffectedXWalls[kMaxXWalls];
 extern 
 #endif
 
-inline bool IsPlayerSprite(spritetype *pSprite)
+inline bool IsPlayerSprite(spritetype const * const pSprite)
 {
     if (pSprite->type >= kDudePlayer1 && pSprite->type <= kDudePlayer8)
         return 1;
     return 0;
 }
 
-template<typename T> bool IsDudeSprite(T *pSprite)
+template<typename T> bool IsDudeSprite(T const * const pSprite)
 {
     if (pSprite->type >= kDudeBase && pSprite->type < kDudeMax)
         return 1;
diff --git a/source/blood/src/db.h b/source/blood/src/db.h
index 6cd060aa9..5870c76c2 100644
--- a/source/blood/src/db.h
+++ b/source/blood/src/db.h
@@ -312,7 +312,7 @@ static inline int GetWallType(int nWall)
     return wall[nWall].type;
 }
 
-template<typename T> void GetSpriteExtents(T *pSprite, int *top, int *bottom)
+template<typename T> void GetSpriteExtents(T const * const pSprite, int *top, int *bottom)
 {
     *top = *bottom = pSprite->z;
     if ((pSprite->cstat & 0x30) != 0x20)
diff --git a/source/blood/src/view.cpp b/source/blood/src/view.cpp
index 2bf7b3f21..6de0c0cf4 100644
--- a/source/blood/src/view.cpp
+++ b/source/blood/src/view.cpp
@@ -1887,7 +1887,7 @@ void viewDrawInterface(ClockTicks arg)
 
 static fix16_t gCameraAng;
 
-template<typename T> tspritetype* viewInsertTSprite(int nSector, int nStatnum, T *pSprite)
+template<typename T> tspritetype* viewInsertTSprite(int nSector, int nStatnum, T const * const pSprite)
 {
     int nTSprite = spritesortcnt;
     tspritetype *pTSprite = &tsprite[nTSprite];