diff --git a/htp/htp_utf8_decoder.c b/htp/htp_utf8_decoder.c
index 412e2909..6017a187 100644
--- a/htp/htp_utf8_decoder.c
+++ b/htp/htp_utf8_decoder.c
@@ -96,26 +96,6 @@ static const uint8_t utf8d_allow_overlong[] = {
   1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // s7..s8
 };
 
-/**
- * Process one byte of UTF-8 data and return a code point if one is available.
- *
- * @param[in] state
- * @param[in] codep
- * @param[in] byte
- * @return HTP_UTF8_ACCEPT for a valid character, HTP_UTF8_REJECT for an invalid character,
- *         or something else if the character has not yet been formed
- */
-uint32_t htp_utf8_decode(uint32_t* state, uint32_t* codep, uint32_t byte) {
-  uint32_t type = utf8d[byte];
-
-  *codep = (*state != HTP_UTF8_ACCEPT) ?
-    (byte & 0x3fu) | (*codep << 6) :
-    (0xff >> type) & (byte);
-
-  *state = utf8d[256 + *state*16 + type];
-  return *state;
-}
-
 /**
  * Process one byte of UTF-8 data and return a code point if one is available. Allows
  * overlong characters in input.
diff --git a/htp/htp_utf8_decoder.h b/htp/htp_utf8_decoder.h
index b90b9267..b39abdd0 100644
--- a/htp/htp_utf8_decoder.h
+++ b/htp/htp_utf8_decoder.h
@@ -76,7 +76,6 @@ extern "C" {
 #define HTP_UTF8_ACCEPT 0
 #define HTP_UTF8_REJECT 1
 
-uint32_t htp_utf8_decode(uint32_t* state, uint32_t* codep, uint32_t byte);
 uint32_t htp_utf8_decode_allow_overlong(uint32_t* state, uint32_t* codep, uint32_t byte);
 
 #ifdef __cplusplus
diff --git a/test/test_utils.cpp b/test/test_utils.cpp
index 2aed63f2..acc1c607 100644
--- a/test/test_utils.cpp
+++ b/test/test_utils.cpp
@@ -43,17 +43,6 @@
 #include <gtest/gtest.h>
 #include <htp/htp_private.h>
 
-TEST(Utf8, SingleByte) {
-    uint32_t state = HTP_UTF8_ACCEPT;
-    uint32_t codep;
-    uint32_t result;
-
-    result = htp_utf8_decode(&state, &codep, 0x00);
-    EXPECT_EQ(0, result);
-    EXPECT_EQ(HTP_UTF8_ACCEPT, state);
-    EXPECT_EQ(0, codep);
-}
-
 TEST(Base64, Single) {
     EXPECT_EQ(62, htp_base64_decode_single('+'));
     EXPECT_EQ(63, htp_base64_decode_single('/'));