diff --git a/src/rp2_common/hardware_clocks/clocks.c b/src/rp2_common/hardware_clocks/clocks.c
index 0a679b61..86c5e8db 100644
--- a/src/rp2_common/hardware_clocks/clocks.c
+++ b/src/rp2_common/hardware_clocks/clocks.c
@@ -216,10 +216,6 @@ void clock_set_reported_hz(enum clock_index clk_index, uint hz) {
 
 /// \tag::frequency_count_khz[]
 uint32_t frequency_count_khz(uint src) {
-    return frequency_count_raw(src, clock_get_hz(clk_ref) / 1000) >> CLOCKS_FC0_RESULT_KHZ_LSB;
-}
-
-uint32_t frequency_count_raw(uint src, uint ref_khz) {
     fc_hw_t *fc = &clocks_hw->fc0;
 
     // If frequency counter is running need to wait for it. It runs even if the source is NULL
@@ -228,7 +224,7 @@ uint32_t frequency_count_raw(uint src, uint ref_khz) {
     }
 
     // Set reference freq
-    fc->ref_khz = ref_khz;
+    fc->ref_khz = clock_get_hz(clk_ref) / 1000;
 
     // FIXME: Don't pick random interval. Use best interval
     fc->interval = 10;
@@ -245,11 +241,10 @@ uint32_t frequency_count_raw(uint src, uint ref_khz) {
     }
 
     // Return the result
-    return fc->result;
+    return fc->result >> CLOCKS_FC0_RESULT_KHZ_LSB;
 }
 /// \end::frequency_count_khz[]
 
-
 static void clocks_handle_resus(void) {
     // Set clk_sys back to the ref clock rather than it being forced to clk_ref
     // by resus. Call the user's resus callback if they have set one
diff --git a/src/rp2_common/hardware_clocks/include/hardware/clocks.h b/src/rp2_common/hardware_clocks/include/hardware/clocks.h
index 03d5e54d..bc4d9ac1 100644
--- a/src/rp2_common/hardware_clocks/include/hardware/clocks.h
+++ b/src/rp2_common/hardware_clocks/include/hardware/clocks.h
@@ -137,15 +137,6 @@ uint32_t clock_get_hz(enum clock_index clk_index);
  */
 uint32_t frequency_count_khz(uint src);
 
-/*! \brief Measure a clocks frequency using the Frequency counter, returning the raw register value
- *  \ingroup hardware_clocks
- *
- * Uses the inbuilt frequency counter to measure the specified clocks frequency.
- *
- * \return the value of the CLOCKS_FC0_RESULT register
- */
-uint32_t frequency_count_raw(uint src, uint ref_khz);
-
 /*! \brief Set the "current frequency" of the clock as reported by clock_get_hz without actually changing the clock
  *  \ingroup hardware_clocks
  *