diff --git a/src/os/unix/unix.cpp b/src/os/unix/unix.cpp
index 855fdb98c32..5fed998a1d5 100644
--- a/src/os/unix/unix.cpp
+++ b/src/os/unix/unix.cpp
@@ -196,7 +196,7 @@ static std::string convert_tofrom_fs(iconv_t convd, std::string_view name)
 	iconv(convd, nullptr, nullptr, nullptr, nullptr);
 	if (iconv(convd, &inbuf, &inlen, &outbuf, &outlen) == (size_t)(-1)) {
 		Debug(misc, 0, "[iconv] error converting '{}'. Errno {}", name, errno);
-		return name;
+		return {};
 	}
 
 	buf.resize(outbuf - buf.data());
@@ -215,8 +215,8 @@ std::string OTTD2FS(std::string_view name)
 		const char *env = GetLocalCode();
 		convd = iconv_open(env, INTERNALCODE);
 		if (convd == (iconv_t)(-1)) {
-			DEBUG(misc, 0, "[iconv] conversion from codeset '%s' to '%s' unsupported", INTERNALCODE, env);
-			return name;
+			Debug(misc, 0, "[iconv] conversion from codeset '{}' to '{}' unsupported", INTERNALCODE, env);
+			return {};
 		}
 	}
 
@@ -235,8 +235,8 @@ std::string FS2OTTD(std::string_view name)
 		const char *env = GetLocalCode();
 		convd = iconv_open(INTERNALCODE, env);
 		if (convd == (iconv_t)(-1)) {
-			DEBUG(misc, 0, "[iconv] conversion from codeset '%s' to '%s' unsupported", env, INTERNALCODE);
-			return name;
+			Debug(misc, 0, "[iconv] conversion from codeset '{}' to '{}' unsupported", env, INTERNALCODE);
+			return {};
 		}
 	}
 
@@ -311,7 +311,7 @@ void OSOpenBrowser(const std::string &url)
 	args[1] = url.c_str();
 	args[2] = nullptr;
 	execvp(args[0], const_cast<char * const *>(args));
-	DEBUG(misc, 0, "Failed to open url: %s", url.c_str());
+	Debug(misc, 0, "Failed to open url: {}", url);
 	exit(0);
 }
 #endif /* __APPLE__ */