diff --git a/Makefile b/Makefile
index d8af2bd..140ba86 100644
--- a/Makefile
+++ b/Makefile
@@ -11,14 +11,24 @@ SIGNING_KEY_ID=F8D7D525
 VERSION=HEAD
 PACKAGE_NAME=rfc4627_jsonrpc
 
-## The path to httpd.hrl has changed in OTP R14A and newer. Detect the
-## change, and supply a compile-time macro definition to allow
-## rfc4627_jsonrpc_inets.erl to adapt to the new path.
-ifeq ($(shell test R14A \> $$(erl -noshell -eval 'io:format(erlang:system_info(otp_release)), halt().') && echo yes),yes)
-INETS_DEF=-Dold_inets
+## The path to httpd.hrl changed sometime between OTP R12 and R13B03,
+## and then changed again between OTP R14B and R14B01. Detect the
+## changes, and supply compile-time macro definitions to allow
+## rfc4627_jsonrpc_inets.erl to adapt to the new paths.
+ERLANG_OTP_RELEASE:=$(shell erl -noshell -eval 'io:format(erlang:system_info(otp_release)), halt().')
+$(info Building for OTP release $(ERLANG_OTP_RELEASE).)
+ifeq ($(shell test R13B03 \> $(ERLANG_OTP_RELEASE) && echo yes),yes)
+$(info Using path to INETS httpd.hrl that existed before R13B03.)
+INETS_DEF=-Dinets_pre_r13b03
 else
+ifeq ($(shell test R14B01 \> $(ERLANG_OTP_RELEASE) && echo yes),yes)
+$(info Using path to INETS httpd.hrl that existed before R14B01.)
+INETS_DEF=-Dinets_pre_r14b01
+else
+$(info Using path to INETS httpd.hrl that exists in releases at and after R14B01.)
 INETS_DEF=
 endif
+endif
 
 all: $(TARGETS)
 
diff --git a/src/rfc4627_jsonrpc_inets.erl b/src/rfc4627_jsonrpc_inets.erl
index 7890315..6f7ae0e 100644
--- a/src/rfc4627_jsonrpc_inets.erl
+++ b/src/rfc4627_jsonrpc_inets.erl
@@ -88,13 +88,17 @@
 -module(rfc4627_jsonrpc_inets).
 -include("rfc4627_jsonrpc.hrl").
 
-%% The path to httpd.hrl has changed in OTP R14A and newer. Our
-%% Makefile detects the change for us, and supplies a compile-time
-%% macro definition to allow us to adapt to the new path.
--ifdef(old_inets).
+%% The path to httpd.hrl has changed with various OTP releases. Our
+%% Makefile detects the changes for us, and supplies compile-time
+%% macro definitions to allow us to adapt.
+-ifdef(inets_pre_r13b03).
 -include_lib("inets/src/httpd.hrl").
 -else.
+-ifdef(inets_pre_r14b01).
 -include_lib("inets/src/http_server/httpd.hrl").
+-else.
+-include_lib("inets/include/httpd.hrl").
+-endif.
 -endif.
 
 -export([do/1, load/2]).