diff --git a/Makefile.am b/Makefile.am
index 2660b32..7f58aa3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -6,7 +6,7 @@
                 manager.cpp \
                 group.cpp
 
-if !LED_USE_JSON
+if !WANTS_JSON
 BUILT_SOURCES = led-gen.hpp
 CLEANFILES = led-gen.hpp
 
diff --git a/configure.ac b/configure.ac
index 49c1b01..5a9c2e0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -74,8 +74,10 @@
 # enable JSON configuration
 AC_ARG_ENABLE([use_json],
     AS_HELP_STRING([--enable-use_json], [Enable JSON configuration.]))
-AC_DEFINE([LED_USE_JSON],[],[Enable JSON configuration.])
-AM_CONDITIONAL([LED_USE_JSON], [test "x$enable-use_json" == "xyes"])
+AM_CONDITIONAL([WANTS_JSON], [test "x$enable_use_json" == "xyes"])
+AS_IF([test "x$enable_use_json" == "xyes"],
+    AC_DEFINE([LED_USE_JSON],[],[Enable JSON configuration.])
+)
 
 AC_DEFINE(CALLOUT_FWD_ASSOCIATION, "callout", [The name of the callout's forward association.])
 AC_DEFINE(CALLOUT_REV_ASSOCIATION, "fault", [The name of the callout's reverse association.])