diff --git a/src/d_iwad.cpp b/src/d_iwad.cpp
index ebce048bc5..f10d48fb7d 100644
--- a/src/d_iwad.cpp
+++ b/src/d_iwad.cpp
@@ -405,7 +405,7 @@ void FIWadManager::CollectSearchPaths()
 	for (auto &str : mSearchPaths)
 	{
 		FixPathSeperator(str);
-		if (str[str.Len() - 1] == '/') str.Truncate(str.Len() - 1);
+		if (str.Back() == '/') str.Truncate(str.Len() - 1);
 	}
 }
 
diff --git a/src/d_main.cpp b/src/d_main.cpp
index 90dbb99b4c..06a7720664 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -1720,7 +1720,7 @@ const char *BaseFileSearch (const char *file, const char *ext, bool lookfirstinp
 	}
 	if (lookfirstinprogdir)
 	{
-		mysnprintf (wad, countof(wad), "%s%s%s", progdir.GetChars(), progdir[progdir.Len() - 1] != '/' ? "/" : "", file);
+		mysnprintf (wad, countof(wad), "%s%s%s", progdir.GetChars(), progdir.Back() == '/' ? "" : "/", file);
 		if (DirEntryExists (wad))
 		{
 			return wad;
@@ -1747,7 +1747,7 @@ const char *BaseFileSearch (const char *file, const char *ext, bool lookfirstinp
 				dir = NicePath(value);
 				if (dir.IsNotEmpty())
 				{
-					mysnprintf (wad, countof(wad), "%s%s%s", dir.GetChars(), dir[dir.Len() - 1] != '/' ? "/" : "", file);
+					mysnprintf (wad, countof(wad), "%s%s%s", dir.GetChars(), dir.Back() == '/' ? "" : "/", file);
 					if (DirEntryExists (wad))
 					{
 						return wad;
diff --git a/src/pathexpander.cpp b/src/pathexpander.cpp
index 2ed0f3ec32..70f9fccc30 100644
--- a/src/pathexpander.cpp
+++ b/src/pathexpander.cpp
@@ -48,7 +48,7 @@ static FString BuildPath(const FString &base, const char *name)
 	if (base.IsNotEmpty())
 	{
 		current = base;
-		if (current[current.Len() - 1] != '/') current += '/';
+		if (current.Back() != '/') current += '/';
 	}
 	current += name;
 	return current;
diff --git a/src/sc_man.cpp b/src/sc_man.cpp
index 590cba58c7..6482fbc103 100644
--- a/src/sc_man.cpp
+++ b/src/sc_man.cpp
@@ -321,11 +321,11 @@ void FScanner::PrepareScript ()
 {
 	// The scanner requires the file to end with a '\n', so add one if
 	// it doesn't already.
-	if (ScriptBuffer.Len() == 0 || ScriptBuffer[ScriptBuffer.Len() - 1] != '\n')
+	if (ScriptBuffer.Len() == 0 || ScriptBuffer.Back() != '\n')
 	{
 		// If the last character in the buffer is a null character, change
 		// it to a newline. Otherwise, append a newline to the end.
-		if (ScriptBuffer.Len() > 0 && ScriptBuffer[ScriptBuffer.Len() - 1] == '\0')
+		if (ScriptBuffer.Len() > 0 && ScriptBuffer.Back() == '\0')
 		{
 			ScriptBuffer.LockBuffer()[ScriptBuffer.Len() - 1] = '\n';
 			ScriptBuffer.UnlockBuffer();
diff --git a/src/scripting/thingdef_data.cpp b/src/scripting/thingdef_data.cpp
index 5f4898b369..08fd1a910c 100644
--- a/src/scripting/thingdef_data.cpp
+++ b/src/scripting/thingdef_data.cpp
@@ -1051,7 +1051,7 @@ FString FStringFormat(VM_ARGS)
 		if (in_fmt)
 		{
 			if ((c >= '0' && c <= '9') ||
-				c == '-' || c == '+' || (c == ' ' && fmt_current[fmt_current.Len() - 1] != ' ') || c == '#' || c == '.')
+				c == '-' || c == '+' || (c == ' ' && fmt_current.Back() != ' ') || c == '#' || c == '.')
 			{
 				fmt_current += c;
 			}