diff --git a/libctru/source/romfs_dev.c b/libctru/source/romfs_dev.c
index a6841a9..9410f0a 100644
--- a/libctru/source/romfs_dev.c
+++ b/libctru/source/romfs_dev.c
@@ -114,14 +114,19 @@ typedef struct
 
 static Result romfsInitCommon(void);
 
+__attribute__((weak)) const char* __romfs_path = NULL;
+
 Result romfsInit(void)
 {
 	if (romFS_active) return 0;
 	if (envIsHomebrew())
 	{
 		// RomFS appended to a 3DSX file
-		if (__system_argc == 0 || !__system_argv[0]) return 1;
-		const char* filename = __system_argv[0];
+		const char* filename = __romfs_path;
+		if (__system_argc > 0 && __system_argv[0])
+			filename = __system_argv[0];
+		if (!filename) return 1;
+
 		if (strncmp(filename, "sdmc:/", 6) == 0)
 			filename += 5;
 		else if (strncmp(filename, "3dslink:/", 9) == 0)