diff --git a/src/c_kzg_4844.c b/src/c_kzg_4844.c
index 9e74007..8172ee0 100644
--- a/src/c_kzg_4844.c
+++ b/src/c_kzg_4844.c
@@ -44,6 +44,17 @@
         (p) = NULL; \
     })
 
+///////////////////////////////////////////////////////////////////////////////
+// Types
+///////////////////////////////////////////////////////////////////////////////
+
+/**
+ * Internal representation of a polynomial.
+ */
+typedef struct {
+    fr_t evals[FIELD_ELEMENTS_PER_BLOB];
+} Polynomial;
+
 ///////////////////////////////////////////////////////////////////////////////
 // Constants
 ///////////////////////////////////////////////////////////////////////////////
diff --git a/src/c_kzg_4844.h b/src/c_kzg_4844.h
index 9ea28ec..d5a3ace 100644
--- a/src/c_kzg_4844.h
+++ b/src/c_kzg_4844.h
@@ -62,13 +62,6 @@ typedef blst_p1 g1_t; /**< Internal G1 group element type. */
 typedef blst_p2 g2_t; /**< Internal G2 group element type. */
 typedef blst_fr fr_t; /**< Internal Fr field element type. */
 
-/**
- * Internal representation of a polynomial.
- */
-typedef struct {
-    fr_t evals[FIELD_ELEMENTS_PER_BLOB];
-} Polynomial;
-
 /**
  * An array of 32 bytes. Represents an untrusted
  * (potentially invalid) field element.