diff --git a/tests/dialects/test_builtin.py b/tests/dialects/test_builtin.py
index cc8f1af224..4811a813fa 100644
--- a/tests/dialects/test_builtin.py
+++ b/tests/dialects/test_builtin.py
@@ -33,6 +33,7 @@
     VectorBaseTypeConstraint,
     VectorRankConstraint,
     VectorType,
+    f16,
     f32,
     f64,
     i1,
@@ -58,8 +59,7 @@ def test_FloatType_bitwidths():
 def test_FloatType_formats():
     with pytest.raises(NotImplementedError):
         BFloat16Type().format
-    with pytest.raises(NotImplementedError):
-        Float16Type().format
+    assert Float16Type().format == "<e"
     assert Float32Type().format == "<f"
     assert Float64Type().format == "<d"
     with pytest.raises(NotImplementedError):
@@ -172,6 +172,12 @@ def test_IntegerType_packing():
     unpacked_i64 = i64.unpack(buffer_i64, len(nums_i64))
     assert nums_i64 == unpacked_i64
 
+    # f16
+    nums_f16 = (-3.140625, -1.0, 0.0, 1.0, 3.140625)
+    buffer_f16 = f16.pack(nums_f16)
+    unpacked_f16 = f16.unpack(buffer_f16, len(nums_f16))
+    assert nums_f16 == unpacked_f16
+
     # f32
     nums_f32 = (-3.140000104904175, -1.0, 0.0, 1.0, 3.140000104904175)
     buffer_f32 = f32.pack(nums_f32)
diff --git a/xdsl/dialects/builtin.py b/xdsl/dialects/builtin.py
index 15fc5915c4..d5623d6850 100644
--- a/xdsl/dialects/builtin.py
+++ b/xdsl/dialects/builtin.py
@@ -699,7 +699,7 @@ def bitwidth(self) -> int:
 
     @property
     def format(self) -> str:
-        raise NotImplementedError()
+        return "<e"
 
 
 @irdl_attr_definition