diff --git a/test/simple-memory-corruption/.gitignore b/test/simple-memory-corruption/.gitignore
index 491592c..7a9ba96 100644
--- a/test/simple-memory-corruption/.gitignore
+++ b/test/simple-memory-corruption/.gitignore
@@ -23,4 +23,7 @@ write_after_free_large_reuse
 write_after_free_small
 write_after_free_small_reuse
 write_zero_size
+unaligned_malloc_usable_size_small
+invalid_malloc_usable_size_small
+invalid_malloc_usable_size_small_quarantine
 __pycache__/
diff --git a/test/simple-memory-corruption/Makefile b/test/simple-memory-corruption/Makefile
index 2b7852c..2fa4daf 100644
--- a/test/simple-memory-corruption/Makefile
+++ b/test/simple-memory-corruption/Makefile
@@ -23,7 +23,10 @@ EXECUTABLES := \
     eight_byte_overflow_small \
     eight_byte_overflow_large \
     string_overflow \
-    delete_type_size_mismatch
+    delete_type_size_mismatch \
+	unaligned_malloc_usable_size_small \
+	invalid_malloc_usable_size_small \
+	invalid_malloc_usable_size_small_quarantine
 
 all: $(EXECUTABLES)
 
diff --git a/test/simple-memory-corruption/invalid_malloc_usable_size_small.c b/test/simple-memory-corruption/invalid_malloc_usable_size_small.c
new file mode 100644
index 0000000..3a155b2
--- /dev/null
+++ b/test/simple-memory-corruption/invalid_malloc_usable_size_small.c
@@ -0,0 +1,12 @@
+#include <malloc.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(16);
+    if (!p) {
+        return 1;
+    }
+    char *q = p + 4096 * 4;
+    malloc_usable_size(q);
+    return 0;
+}
diff --git a/test/simple-memory-corruption/invalid_malloc_usable_size_small_quarantine.c b/test/simple-memory-corruption/invalid_malloc_usable_size_small_quarantine.c
new file mode 100644
index 0000000..5a8f3ea
--- /dev/null
+++ b/test/simple-memory-corruption/invalid_malloc_usable_size_small_quarantine.c
@@ -0,0 +1,12 @@
+#include <malloc.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    void *p = malloc(16);
+    if (!p) {
+        return 1;
+    }
+    free(p);
+    malloc_usable_size(p);
+    return 0;
+}
diff --git a/test/simple-memory-corruption/test_smc.py b/test/simple-memory-corruption/test_smc.py
index 182dc6b..006bdfa 100644
--- a/test/simple-memory-corruption/test_smc.py
+++ b/test/simple-memory-corruption/test_smc.py
@@ -86,6 +86,20 @@ class TestSimpleMemoryCorruption(unittest.TestCase):
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid free\n")
 
+    def test_invalid_malloc_usable_size_small_quarantene(self):
+        _stdout, stderr, returncode = self.run_test(
+            "invalid_malloc_usable_size_small_quarantine")
+        self.assertEqual(returncode, -6)
+        self.assertEqual(stderr.decode(
+            "utf-8"), "fatal allocator error: invalid malloc_usable_size (quarantine)\n")
+
+    def test_invalid_malloc_usable_size_small(self):
+        _stdout, stderr, returncode = self.run_test(
+            "invalid_malloc_usable_size_small")
+        self.assertEqual(returncode, -6)
+        self.assertEqual(stderr.decode(
+            "utf-8"), "fatal allocator error: invalid malloc_usable_size\n")
+
     def test_read_after_free_large(self):
         _stdout, _stderr, returncode = self.run_test("read_after_free_large")
         self.assertEqual(returncode, -11)
@@ -117,6 +131,13 @@ class TestSimpleMemoryCorruption(unittest.TestCase):
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid unaligned free\n")
 
+    def test_unaligned_malloc_usable_size_small(self):
+        _stdout, stderr, returncode = self.run_test(
+            "unaligned_malloc_usable_size_small")
+        self.assertEqual(returncode, -6)
+        self.assertEqual(stderr.decode("utf-8"),
+                         "fatal allocator error: invalid unaligned malloc_usable_size\n")
+
     def test_uninitialized_free(self):
         _stdout, stderr, returncode = self.run_test("uninitialized_free")
         self.assertEqual(returncode, -6)
diff --git a/test/simple-memory-corruption/unaligned_malloc_usable_size_small.c b/test/simple-memory-corruption/unaligned_malloc_usable_size_small.c
new file mode 100644
index 0000000..89397af
--- /dev/null
+++ b/test/simple-memory-corruption/unaligned_malloc_usable_size_small.c
@@ -0,0 +1,11 @@
+#include <malloc.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(16);
+    if (!p) {
+        return 1;
+    }
+    malloc_usable_size(p + 1);
+    return 0;
+}