diff --git a/tests/tfpt_tests.cpp b/tests/tfpt_tests.cpp
index e6642e2..96d0e11 100644
--- a/tests/tfpt_tests.cpp
+++ b/tests/tfpt_tests.cpp
@@ -36,10 +36,18 @@ TEST(TFTP, custom_fread)
     EXPECT_EQ(bytes, 11);
     EXPECT_EQ(memcmp(buf, "1234567890", 10), 0);
 
+    memset(buf, 0, 11);
+
     tftp_custom_fseek(&file, 0, SEEK_SET);
     bytes = tftp_custom_fread(buf, 5, &file);
     EXPECT_EQ(bytes, 5);
     EXPECT_EQ(memcmp(buf, "12345", 5), 0);
+
+    memset(buf, 0, 11);
+
+    bytes = tftp_custom_fread(buf, 5, &file);
+    EXPECT_EQ(bytes, 5);
+    EXPECT_EQ(memcmp(buf, "67890", 5), 0);
 }