diff --git a/corsikaio/subblocks/event_header.py b/corsikaio/subblocks/event_header.py
index 215e1f0..56f70ec 100644
--- a/corsikaio/subblocks/event_header.py
+++ b/corsikaio/subblocks/event_header.py
@@ -14,8 +14,8 @@
     Field(8, "momentum_x", unit="GeV/c"),
     Field(9, "momentum_y", unit="GeV/c"),
     Field(10, "momentum_minus_z", unit="GeV/c"),
-    Field(11, "zenith", unit="deg"),
-    Field(12, "azimuth", unit="deg"),
+    Field(11, "zenith", unit="rad"),
+    Field(12, "azimuth", unit="rad"),
     Field(13, "n_random_sequences"),
     Field(13 + 1, "random_seeds", shape=(10, 3)),
     Field(44, "run_number"),