diff --git a/polymer/eduke32/build/include/build.h b/polymer/eduke32/build/include/build.h
index 20752be07..34b9b4c85 100644
--- a/polymer/eduke32/build/include/build.h
+++ b/polymer/eduke32/build/include/build.h
@@ -348,7 +348,7 @@ EXTERN int16_t nextspritesect[MAXSPRITES], nextspritestat[MAXSPRITES];
 EXTERN int16_t tilesizx[MAXTILES], tilesizy[MAXTILES];
 EXTERN char picsiz[MAXTILES];
 EXTERN char walock[MAXTILES];
-EXTERN int32_t pow2long[32];
+EXTERN const int32_t pow2long[32];
 EXTERN int32_t picanm[MAXTILES];
 EXTERN intptr_t waloff[MAXTILES];  // stores pointers to cache  -- SA
 
diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index 7bd76abd4..9de65ddd4 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -96,7 +96,8 @@ int32_t editorgridextent = 131072;
 #define MAXYSIZ 256
 #define MAXZSIZ 255
 #define MAXVOXMIPS 5
-static intptr_t voxoff[MAXVOXELS][MAXVOXMIPS]; char voxlock[MAXVOXELS][MAXVOXMIPS];
+static intptr_t voxoff[MAXVOXELS][MAXVOXMIPS];
+static char voxlock[MAXVOXELS][MAXVOXMIPS];
 int32_t voxscale[MAXVOXELS];
 
 static int32_t ggxinc[MAXXSIZ+1], ggyinc[MAXXSIZ+1];
@@ -142,7 +143,7 @@ static int32_t lastageclock;
 
 static int32_t artsize = 0, cachesize = 0;
 
-// maximum number of ART files
+// Whole ART file contents loaded from ZIPs in memory.
 static char *artptrs[MAXTILEFILES];
 
 // GCC 4.6 LTO build fix
@@ -154,8 +155,8 @@ static char *artptrs[MAXTILEFILES];
 
 static int16_t radarang2[MAXXDIM];
 B_ENGINE_STATIC uint16_t ATTRIBUTE((used)) sqrtable[4096], ATTRIBUTE((used)) shlookup[4096+256];
-char pow2char[8] = {1,2,4,8,16,32,64,128};
-int32_t pow2long[32] =
+const char pow2char[8] = {1,2,4,8,16,32,64,128};
+const int32_t pow2long[32] =
 {
     1L,2L,4L,8L,
     16L,32L,64L,128L,
diff --git a/polymer/eduke32/build/src/engine_priv.h b/polymer/eduke32/build/src/engine_priv.h
index eebb4e78e..79160d42c 100644
--- a/polymer/eduke32/build/src/engine_priv.h
+++ b/polymer/eduke32/build/src/engine_priv.h
@@ -23,8 +23,8 @@
 extern uint8_t basepalcount;
 extern uint8_t curbasepal;
 
-extern char pow2char[8];
-extern int32_t pow2int[32];
+extern const char pow2char[8];
+extern const int32_t pow2int[32];
 
 extern int16_t thesector[MAXWALLSB], thewall[MAXWALLSB];
 extern int16_t bunchfirst[MAXWALLSB], bunchlast[MAXWALLSB];
diff --git a/polymer/eduke32/source/premap.c b/polymer/eduke32/source/premap.c
index 859f76ce8..242666e76 100644
--- a/polymer/eduke32/source/premap.c
+++ b/polymer/eduke32/source/premap.c
@@ -41,8 +41,6 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 extern El_State g_ElState;
 #endif
 
-extern char pow2char[];
-
 static int32_t g_whichPalForPlayer = 9;
 int32_t g_numRealPalettes;
 int16_t SpriteCacheList[MAXTILES][3];
diff --git a/polymer/eduke32/source/premap.h b/polymer/eduke32/source/premap.h
index 7b2101dc8..b2b283f7c 100644
--- a/polymer/eduke32/source/premap.h
+++ b/polymer/eduke32/source/premap.h
@@ -24,7 +24,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #define __premap_h__
 
 extern char *g_gameNamePtr;
-extern char pow2char[];
+extern const char pow2char[];
 
 extern int16_t SpriteCacheList[MAXTILES][3];
 extern int32_t g_levelTextTime;