diff --git a/parser.go b/parser.go
index 8da6547a..80ae2913 100644
--- a/parser.go
+++ b/parser.go
@@ -95,6 +95,9 @@ func (p Parser) Parse(spec string) (Schedule, error) {
 	if strings.HasPrefix(spec, "TZ=") || strings.HasPrefix(spec, "CRON_TZ=") {
 		var err error
 		i := strings.Index(spec, " ")
+		if i == -1 {
+			return nil, fmt.Errorf("provided no location %s", spec)
+		}
 		eq := strings.Index(spec, "=")
 		if loc, err = time.LoadLocation(spec[eq+1 : i]); err != nil {
 			return nil, fmt.Errorf("provided bad location %s: %v", spec[eq+1:i], err)
diff --git a/parser_test.go b/parser_test.go
index 41c8c520..25cd3dc6 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -179,6 +179,23 @@ func TestParseSchedule(t *testing.T) {
 			t.Errorf("%s => expected %b, got %b", c.expr, c.expected, actual)
 		}
 	}
+
+	badEntries := []struct {
+		parser Parser
+		expr   string
+	}{
+		{secondParser, "TZ="},
+		{standardParser, "TZ="},
+		{secondParser, "CRON_TZ="},
+		{standardParser, "CRON_TZ="},
+	}
+
+	for _, c := range badEntries {
+		_, err := c.parser.Parse(c.expr)
+		if err == nil {
+			t.Errorf("%s => expected error but got none", c.expr)
+		}
+	}
 }
 
 func TestOptionalSecondSchedule(t *testing.T) {