diff --git a/src/r_data.c b/src/r_data.c
index 8fc6ed333..b4ae9eeae 100644
--- a/src/r_data.c
+++ b/src/r_data.c
@@ -49,10 +49,10 @@
 size_t numspritelumps, max_spritelumps;
 
 // needed for pre rendering
-sprcache_t *spritecachedinfo;
+sprcache_t *spritecachedinfo = NULL;
 
-lighttable_t *colormaps;
-UINT8 *encoremap;
+lighttable_t *colormaps = NULL;
+UINT8 *encoremap = NULL;
 
 // for debugging/info purposes
 size_t flatmemory, spritememory, texturememory;
diff --git a/src/r_plane.cpp b/src/r_plane.cpp
index 93bc197e1..976f92c18 100644
--- a/src/r_plane.cpp
+++ b/src/r_plane.cpp
@@ -52,15 +52,15 @@ consvar_t cv_parallelsoftware = CVAR_INIT ("parallelsoftware", "On", CV_SAVE, CV
 
 //SoM: 3/23/2000: Use Boom visplane hashing.
 
-visplane_t *visplanes[MAXVISPLANES];
+visplane_t *visplanes[MAXVISPLANES] = {};
 static visplane_t *freetail;
 static visplane_t **freehead = &freetail;
 
 visplane_t *floorplane;
 visplane_t *ceilingplane;
 
-visffloor_t ffloor[MAXFFLOORS];
-INT32 numffloors;
+visffloor_t ffloor[MAXFFLOORS] ={};
+INT32 numffloors = 0;
 
 //SoM: 3/23/2000: Boom visplane hashing routine.
 #define visplane_hash(picnum,lightlevel,height) \
@@ -92,7 +92,7 @@ static INT32 spanstart[MAXVIDHEIGHT];
 //                (when mouselookin', yslope is moving into yslopetab)
 //                Check R_SetupFrame, R_SetViewSize for more...
 fixed_t yslopetab[MAXSPLITSCREENPLAYERS][MAXVIDHEIGHT*16];
-fixed_t *yslope;
+fixed_t *yslope = NULL;
 
 //
 // R_InitPlanes
diff --git a/src/r_textures.c b/src/r_textures.c
index a3bcf3973..64324a708 100644
--- a/src/r_textures.c
+++ b/src/r_textures.c
@@ -53,11 +53,11 @@ UINT32 **texturecolumnofs; // column offset lookup table for each texture
 UINT8 **texturecache; // graphics data for each generated full-size texture
 UINT8 **texturebrightmapcache; // graphics data for brightmap converted for use with a specific texture
 
-INT32 *texturewidth;
-fixed_t *textureheight; // needed for texture pegging
+INT32 *texturewidth = NULL;
+fixed_t *textureheight = NULL; // needed for texture pegging
 
-INT32 *texturetranslation;
-INT32 *texturebrightmaps;
+INT32 *texturetranslation = NULL;
+INT32 *texturebrightmaps = NULL;
 
 INT32 g_texturenum_dbgline;