diff --git a/src/crypto/common.h b/src/crypto/common.h
index 1dc4f3f55ca..d45459b1f62 100644
--- a/src/crypto/common.h
+++ b/src/crypto/common.h
@@ -70,6 +70,12 @@ uint64_t static inline ReadBE64(const unsigned char* ptr)
     return be64toh_internal(x);
 }
 
+void static inline WriteBE16(unsigned char* ptr, uint16_t x)
+{
+    uint16_t v = htobe16_internal(x);
+    memcpy(ptr, &v, 2);
+}
+
 void static inline WriteBE32(unsigned char* ptr, uint32_t x)
 {
     uint32_t v = htobe32_internal(x);
diff --git a/src/test/fuzz/crypto_common.cpp b/src/test/fuzz/crypto_common.cpp
index 8e07dfedb9f..5a76d4e1a91 100644
--- a/src/test/fuzz/crypto_common.cpp
+++ b/src/test/fuzz/crypto_common.cpp
@@ -35,6 +35,10 @@ FUZZ_TARGET(crypto_common)
     WriteLE64(writele64_arr.data(), random_u64);
     assert(ReadLE64(writele64_arr.data()) == random_u64);
 
+    std::array<uint8_t, 2> writebe16_arr;
+    WriteBE16(writebe16_arr.data(), random_u16);
+    assert(ReadBE16(writebe16_arr.data()) == random_u16);
+
     std::array<uint8_t, 4> writebe32_arr;
     WriteBE32(writebe32_arr.data(), random_u32);
     assert(ReadBE32(writebe32_arr.data()) == random_u32);