diff --git a/source/build/src/defs.cpp b/source/build/src/defs.cpp
index f8a6b195c..0ce87e508 100644
--- a/source/build/src/defs.cpp
+++ b/source/build/src/defs.cpp
@@ -361,6 +361,7 @@ static int32_t defsparser(scriptfile *script)
         { "rffdefineid",     T_RFFDEFINEID      },  // dummy
     };
 
+    script->SetNoOctals(true);
     while (1)
     {
 #ifdef USE_DEF_PROGRESS
diff --git a/source/core/textures/buildtiles.cpp b/source/core/textures/buildtiles.cpp
index 882d0c2dc..95f5751b7 100644
--- a/source/core/textures/buildtiles.cpp
+++ b/source/core/textures/buildtiles.cpp
@@ -499,7 +499,7 @@ CCMD(tilecrc)
 
 int tileImportFromTexture(const char* fn, int tilenum, int alphacut, int istexture)
 {
-	FTextureID texid = TexMan.CheckForTexture(fn, ETextureType::Any);
+	FTextureID texid = TexMan.CheckForTexture(fn, ETextureType::Any, FTextureManager::TEXMAN_ForceLookup);
 	if (!texid.isValid()) return -1;
 	auto tex = TexMan.GetGameTexture(texid);
 
@@ -508,7 +508,7 @@ int tileImportFromTexture(const char* fn, int tilenum, int alphacut, int istextu
 	if (xsiz <= 0 || ysiz <= 0)
 		return -2;
 
-	// create a new game texture here - we want to give it a new name!
+	// create a new game texture here - we want to give it a different name!
 	tex = MakeGameTexture(tex->GetTexture(), FStringf("#%05d", tilenum), ETextureType::Override);
 	TexMan.AddGameTexture(tex);
 	TileFiles.tiledata[tilenum].backup = TileFiles.tiledata[tilenum].texture = tex;