diff --git a/ref/gl/gl_rpart.c b/ref/gl/gl_rpart.c
index 963f7323..9264170d 100644
--- a/ref/gl/gl_rpart.c
+++ b/ref/gl/gl_rpart.c
@@ -229,7 +229,7 @@ void CL_DrawTracers( double frametime, particle_t *cl_active_tracers )
 			VectorAdd( verts[0], delta, verts[2] );
 			VectorAdd( verts[1], delta, verts[3] );
 
-			if( p->color < 0 || p->color > sizeof( gTracerColors ) / sizeof( gTracerColors[0] ))
+			if( p->color < 0 || p->color >= sizeof( gTracerColors ) / sizeof( gTracerColors[0] ))
 			{
 				p->color = TRACER_COLORINDEX_DEFAULT;
 			}
diff --git a/ref/gl/gl_triapi.c b/ref/gl/gl_triapi.c
index f36120c4..2c23c2f6 100644
--- a/ref/gl/gl_triapi.c
+++ b/ref/gl/gl_triapi.c
@@ -245,7 +245,7 @@ int TriSpriteTexture( model_t *pSpriteModel, int frame )
 	if(( gl_texturenum = R_GetSpriteTexture( pSpriteModel, frame )) == 0 )
 		return 0;
 
-	if( gl_texturenum <= 0 || gl_texturenum > MAX_TEXTURES )
+	if( gl_texturenum <= 0 || gl_texturenum >= MAX_TEXTURES )
 		gl_texturenum = tr.defaultTexture;
 
 	GL_Bind( XASH_TEXTURE0, gl_texturenum );
diff --git a/ref/soft/r_part.c b/ref/soft/r_part.c
index fef1e0c1..6424fdbd 100644
--- a/ref/soft/r_part.c
+++ b/ref/soft/r_part.c
@@ -240,7 +240,7 @@ void GAME_EXPORT CL_DrawTracers( double frametime, particle_t *cl_active_tracers
 			VectorAdd( verts[0], delta, verts[2] );
 			VectorAdd( verts[1], delta, verts[3] );
 
-			if( p->color < 0 || p->color > sizeof( gTracerColors ) / sizeof( gTracerColors[0] ))
+			if( p->color < 0 || p->color >= sizeof( gTracerColors ) / sizeof( gTracerColors[0] ))
 			{
 				p->color = TRACER_COLORINDEX_DEFAULT;
 			}
diff --git a/ref/soft/r_rast.c b/ref/soft/r_rast.c
index 1c316f13..339ff0d7 100644
--- a/ref/soft/r_rast.c
+++ b/ref/soft/r_rast.c
@@ -224,7 +224,7 @@ static void R_EmitEdge( mvertex_t *pv0, mvertex_t *pv1 )
 		v = ceilv0;
 		v2 = r_ceilv1 - 1;
 
-		if( v < 0 || v > MAXHEIGHT )
+		if( v < 0 || v >= MAXHEIGHT )
 		{
 			gEngfuncs.Con_Printf( S_ERROR "trailing edge overflow : %d\n", v );
 			return;
@@ -242,7 +242,7 @@ static void R_EmitEdge( mvertex_t *pv0, mvertex_t *pv1 )
 		v2 = ceilv0 - 1;
 		v = r_ceilv1;
 
-		if( v < 0 || v > MAXHEIGHT )
+		if( v < 0 || v >= MAXHEIGHT )
 		{
 			gEngfuncs.Con_Printf( S_ERROR "leading edge overflow : %d\n", v );
 			return;
diff --git a/ref/soft/r_triapi.c b/ref/soft/r_triapi.c
index cbcdcecd..db829c77 100644
--- a/ref/soft/r_triapi.c
+++ b/ref/soft/r_triapi.c
@@ -289,7 +289,7 @@ int TriSpriteTexture( model_t *pSpriteModel, int frame )
 	if(( gl_texturenum = R_GetSpriteTexture( pSpriteModel, frame )) == 0 )
 		return 0;
 
-	if( gl_texturenum <= 0 || gl_texturenum > MAX_TEXTURES )
+	if( gl_texturenum <= 0 || gl_texturenum >= MAX_TEXTURES )
 		gl_texturenum = tr.defaultTexture;
 
 	GL_Bind( XASH_TEXTURE0, gl_texturenum );