diff --git a/configure b/configure
index 2849fe5915..15db8bff9f 100755
--- a/configure
+++ b/configure
@@ -14105,7 +14105,7 @@ fi
 
 
 
-if test "x$JANSSON_LIB" == "x"; then
+if test "${PBX_JANSSON}" != 1; then
   as_fn_error $? "*** JSON support not found (this typically means the libjansson development package is missing)" "$LINENO" 5
 fi
 
diff --git a/configure.ac b/configure.ac
index 1bb4bc4ff3..5c81144cd5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -659,7 +659,7 @@ AC_SUBST(UUID_LIB)
 # Find required JSON support.
 AST_EXT_LIB_CHECK([JANSSON], [jansson], [json_dumps], [jansson.h])
 
-if test "x$JANSSON_LIB" == "x"; then
+if test "${PBX_JANSSON}" != 1; then
   AC_MSG_ERROR([*** JSON support not found (this typically means the libjansson development package is missing)])
 fi