diff --git a/source/fs.c b/source/fs.c
index 78ea049..fc7061c 100644
--- a/source/fs.c
+++ b/source/fs.c
@@ -10,14 +10,12 @@ static FATFS fs;
 
 u32 mountSD(void)
 {
-    if(f_mount(&fs, "0:", 1) != FR_OK) return 0;
-    return 1;
+    return f_mount(&fs, "0:", 1) == FR_OK;
 }
 
 u32 mountCTRNAND(void)
 {
-    if(f_mount(&fs, "1:", 1) != FR_OK) return 0;
-    return 1;
+    return f_mount(&fs, "1:", 1) == FR_OK;
 }
 
 u32 fileRead(void *dest, const char *path)
diff --git a/source/installer.c b/source/installer.c
index 668668c..e1cb312 100755
--- a/source/installer.c
+++ b/source/installer.c
@@ -59,7 +59,8 @@ void main(void)
 
 static inline void installer(u32 a9lhBoot)
 {
-    mountSD();
+    if(!mountSD())
+        shutdown(1, "Error: failed to mount the SD card");
 
     const char *path;
     u32 updatea9lh = 0;
@@ -192,7 +193,8 @@ static inline void uninstaller(void)
     }
     else memset32((void *)SECTOR_OFFSET, 0, 0x200);
 
-    mountCTRNAND();
+    if(!mountCTRNAND())
+        shutdown(1, "Error: failed to mount CTRNAND");
 
     switch(firmRead((void *)FIRM0_OFFSET))
     {