diff --git a/Utility/DiskFree.hs b/Utility/DiskFree.hs
index 8d07afaf2d..ff70705621 100644
--- a/Utility/DiskFree.hs
+++ b/Utility/DiskFree.hs
@@ -18,7 +18,7 @@ import Foreign.C.Error
 foreign import ccall unsafe "libdiskfree.h diskfree" c_diskfree
 	:: CString -> IO CULLong
 
-getDiskFree :: String -> IO (Maybe Integer)
+getDiskFree :: FilePath -> IO (Maybe Integer)
 getDiskFree path = withFilePath path $ \c_path -> do
 	free <- c_diskfree c_path
 	ifM (safeErrno <$> getErrno)
diff --git a/Utility/libdiskfree.c b/Utility/libdiskfree.c
index 54e8c08942..a37cb75713 100644
--- a/Utility/libdiskfree.c
+++ b/Utility/libdiskfree.c
@@ -58,10 +58,10 @@ unsigned long long int diskfree(const char *path) {
 	unsigned long long int available, blocksize;
 	struct STATSTRUCT buf;
 
-	if (STATCALL(path, &buf) != 0) {
+	if (STATCALL(path, &buf) != 0)
 		return 0; /* errno is set */
-	}
-	errno = 0;
+	else
+		errno = 0;
 
 	available = buf.f_bavail;
 	blocksize = buf.f_bsize;