diff --git a/markdown.go b/markdown.go
index a18cb23..ad28c5c 100644
--- a/markdown.go
+++ b/markdown.go
@@ -58,7 +58,7 @@ func Parse(text string, ext Extensions) *Doc {
 func (d *Doc) parseRule(rule int, s string) {
 	m := d.parser
 	if m.ResetBuffer(s) != "" {
-		log.Exitf("Buffer not empty")
+		log.Fatalf("Buffer not empty")
 	}
 	if !m.Parse(rule) {
 		m.PrintError()
diff --git a/output.go b/output.go
index e8c7b17..d40b17a 100644
--- a/output.go
+++ b/output.go
@@ -181,7 +181,7 @@ func (w *htmlOut) elem(elt *element, obfuscate bool) *htmlOut {
 		w.elist(elt.children, obfuscate)
 	case RAW:
 		/* Shouldn't occur - these are handled by process_raw_blocks() */
-		log.Exitf("RAW")
+		log.Fatalf("RAW")
 	case H1, H2, H3, H4, H5, H6:
 		h := "h" + string('1'+elt.key-H1) + ">"	/* assumes H1 ... H6 are in order */
 		w.pad(2).s("<").s(h).elist(elt.children, obfuscate).s("</").s(h).pset(0)
@@ -223,7 +223,7 @@ func (w *htmlOut) elem(elt *element, obfuscate bool) *htmlOut {
 				nn, nn, nn, nn)
 		}
 	default:
-		log.Exitf("htmlOut.elem encountered unknown element key = %d\n", elt.key)
+		log.Fatalf("htmlOut.elem encountered unknown element key = %d\n", elt.key)
 	}
 	if s != "" {
 		w.s(s)
diff --git a/parser.leg b/parser.leg
index 0287572..3f13e2f 100644
--- a/parser.leg
+++ b/parser.leg
@@ -903,7 +903,7 @@ func match_inlines(l1, l2 *element) bool {
 		case LINK, IMAGE:
 			return false	/* No links or images within links */
 		default:
-			log.Exitf("match_inlines encountered unknown key = %d\n", l1.key)
+			log.Fatalf("match_inlines encountered unknown key = %d\n", l1.key)
 		}
 		l1 = l1.next
 		l2 = l2.next
diff --git a/parser.leg.go b/parser.leg.go
index 48025fa..1bf68b5 100644
--- a/parser.leg.go
+++ b/parser.leg.go
@@ -12341,7 +12341,7 @@ func match_inlines(l1, l2 *element) bool {
 		case LINK, IMAGE:
 			return false	/* No links or images within links */
 		default:
-			log.Exitf("match_inlines encountered unknown key = %d\n", l1.key)
+			log.Fatalf("match_inlines encountered unknown key = %d\n", l1.key)
 		}
 		l1 = l1.next
 		l2 = l2.next