diff --git a/src/wjelement/search.c b/src/wjelement/search.c
index 4956164..e0e6542 100644
--- a/src/wjelement/search.c
+++ b/src/wjelement/search.c
@@ -516,6 +516,19 @@ DebugAssert(0);
 	return(0);
 }
 
+/*
+	Determine if the provided character is valid in an unquoted JSON name.
+	This will mimic the functionality of isalnum(). But this will follow the
+	rules for JSON names, which can be found in RFC 7159. Section 4 states a
+	name must be a string. Section 7 gives the characters that can be used in a
+	name.
+*/
+static int is_json_ch(int c)
+{
+	// unescaped = %x20-21 / %x23-5B / %x5D-10FFFF
+	return((c >= 0x20 && c <= 0x21) || (c >= 0x23 && c <= 0x5B) || (c >= 0x5D && c <= 0x10FFFF));
+}
+
 /*
 	Return the begining of the name of the next element in the path.  Length
 	will be filled out, and end will be set to the first character that is not
@@ -678,14 +691,14 @@ DebugAssert(0);
 				p++;
 			}
 		}
-	} else if (isalnumx(*path)) {
+	} else if (is_json_ch(*path)) {
 		/*
 			alpha-numeric name
 
 			Find the first character that is not part of the alpha-numeric name
 			and verify that it is a valid terminator for this name.
 		*/
-		for (p = path + 1; isalnumx(*p); p++);
+		for (p = path + 1; is_json_ch(*p); p++);
 
 		if (len) *len = p - path;
 		if (!WJENextNameCheck(p, path, len, end)) {