diff --git a/cbits/helpers.h b/cbits/helpers.h
new file mode 100644
--- /dev/null
+++ b/cbits/helpers.h
@@ -0,0 +1,34 @@
+
+#ifndef RIDLEY_HELPERS__
+#define RIDLEY_HELPERS__
+
+#ifdef __APPLE__
+
+// Apple/Darwin specific code
+
+#include <stdlib.h>
+
+// A subset of if_data, as defined in <net/if_var.h>
+struct ridley_if_data {
+  u_int32_t   ridley_ifi_ipackets;       /* packets received on interface */
+  u_int32_t   ridley_ifi_opackets;       /* packets sent on interface */
+  u_int32_t   ridley_ifi_ierrors;        /* input errors on interface */
+  u_int32_t   ridley_ifi_oerrors;        /* output errors on interface */
+  u_int32_t   ridley_ifi_ibytes;         /* total number of octets received */
+  u_int32_t   ridley_ifi_obytes;         /* total number of octets sent */
+  u_int32_t   ridley_ifi_imcasts;        /* packets received via multicast */
+  u_int32_t   ridley_ifi_omcasts;        /* packets sent via multicast */
+  u_int32_t   ridley_ifi_iqdrops;        /* dropped on input, this interface */
+  char*       ridley_ifi_name;           /* The interface name */
+  int         ridley_ifi_error;          /* If there was an error */
+};
+
+typedef struct ridley_if_data ridley_if_data_t;
+
+void free_ridley_if_data(ridley_if_data_t*, int);
+
+// End of Apple/Darwin specific code
+
+#endif
+
+#endif
diff --git a/include/helpers.h b/include/helpers.h
deleted file mode 100644
--- a/include/helpers.h
+++ /dev/null
@@ -1,34 +0,0 @@
-
-#ifndef RIDLEY_HELPERS__
-#define RIDLEY_HELPERS__
-
-#ifdef __APPLE__
-
-// Apple/Darwin specific code
-
-#include <stdlib.h>
-
-// A subset of if_data, as defined in <net/if_var.h>
-struct ridley_if_data {
-  u_int32_t   ridley_ifi_ipackets;       /* packets received on interface */
-  u_int32_t   ridley_ifi_opackets;       /* packets sent on interface */
-  u_int32_t   ridley_ifi_ierrors;        /* input errors on interface */
-  u_int32_t   ridley_ifi_oerrors;        /* output errors on interface */
-  u_int32_t   ridley_ifi_ibytes;         /* total number of octets received */
-  u_int32_t   ridley_ifi_obytes;         /* total number of octets sent */
-  u_int32_t   ridley_ifi_imcasts;        /* packets received via multicast */
-  u_int32_t   ridley_ifi_omcasts;        /* packets sent via multicast */
-  u_int32_t   ridley_ifi_iqdrops;        /* dropped on input, this interface */
-  char*       ridley_ifi_name;           /* The interface name */
-  int         ridley_ifi_error;          /* If there was an error */
-};
-
-typedef struct ridley_if_data ridley_if_data_t;
-
-void free_ridley_if_data(ridley_if_data_t*, int);
-
-// End of Apple/Darwin specific code
-
-#endif
-
-#endif
diff --git a/ridley.cabal b/ridley.cabal
--- a/ridley.cabal
+++ b/ridley.cabal
@@ -1,19 +1,21 @@
 name:                ridley
-version:             0.3.4.0
+version:             0.3.4.1
 synopsis:            Quick metrics to grow your app strong.
 description:         A collection of Prometheus metrics to monitor your app. Please see README.md
 homepage:            https://github.com/iconnect/ridley#README
 license:             BSD3
 license-file:        LICENSE
 author:              Alfredo Di Napoli & the IRIS Connect Engineering Team
-maintainer:          chrisd@irisconnect.co.uk
-copyright:           2022 IRIS Connect Ltd.
+maintainer:          engineering@irisconnect.co.uk
+copyright:           2023 IRIS Connect Ltd.
 category:            Web
 build-type:          Simple
-data-files:
-  include/helpers.h
 cabal-version:       >=1.10
 
+extra-source-files:
+  cbits/helpers.c
+  cbits/helpers.h
+
 flag lib-Werror
      manual: True
      default: False
@@ -26,7 +28,6 @@
 
 library
   hs-source-dirs:      src
-  include-dirs:        include
   exposed-modules:     System.Metrics.Prometheus.Ridley
                        System.Metrics.Prometheus.Ridley.Types
                        System.Metrics.Prometheus.Ridley.Metrics.Memory
@@ -62,6 +63,7 @@
                        vector,
                        unix,
                        unliftio-core
+  include-dirs:        cbits
   c-sources:           cbits/helpers.c
   cc-options:          -Wall -std=c99
   default-language:    Haskell2010
diff --git a/src/System/Metrics/Prometheus/Ridley/Metrics/Network/Darwin.hs b/src/System/Metrics/Prometheus/Ridley/Metrics/Network/Darwin.hs
--- a/src/System/Metrics/Prometheus/Ridley/Metrics/Network/Darwin.hs
+++ b/src/System/Metrics/Prometheus/Ridley/Metrics/Network/Darwin.hs
@@ -128,6 +128,9 @@
        |]
   return (res, totalInterfaces)
 
+foreign import ccall "helpers.h free_ridley_if_data"
+  freeRidleyIFData :: Ptr IfData -> CInt -> IO ()
+
 --------------------------------------------------------------------------------
 getNetworkMetrics :: IO ([IfData], IO ())
 getNetworkMetrics = do
diff --git a/src/System/Metrics/Prometheus/Ridley/Metrics/Network/Types.hsc b/src/System/Metrics/Prometheus/Ridley/Metrics/Network/Types.hsc
--- a/src/System/Metrics/Prometheus/Ridley/Metrics/Network/Types.hsc
+++ b/src/System/Metrics/Prometheus/Ridley/Metrics/Network/Types.hsc
@@ -54,9 +54,6 @@
 
 
 #ifdef darwin_HOST_OS
-foreign import ccall "helpers.h free_ridley_if_data"
-  freeRidleyIFData :: Ptr IfData -> CInt -> IO ()
-
 instance Storable IfData where
   sizeOf _ = #{size ridley_if_data_t}
   alignment _ = #{alignment ridley_if_data_t}