diff --git a/src/document/html/parser/forms.c b/src/document/html/parser/forms.c
index 43f0c234..c765d71d 100644
--- a/src/document/html/parser/forms.c
+++ b/src/document/html/parser/forms.c
@@ -259,6 +259,7 @@ html_input_format(struct html_context *html_context, char *a,
 		case FC_TEXTAREA:
 		case FC_SELECT:
 		case FC_HIDDEN:
+		default:
 			INTERNAL("bad control type");
 	}
 	pop_html_element(html_context);
diff --git a/src/document/html/renderer.c b/src/document/html/renderer.c
index 8f0800d2..d6e223ea 100644
--- a/src/document/html/renderer.c
+++ b/src/document/html/renderer.c
@@ -1502,6 +1502,9 @@ new_link(struct html_context *html_context, char *name, int namelen)
 		case FC_BUTTON:
 		case FC_HIDDEN:
 			link->type = LINK_BUTTON;
+			break;
+		default:
+			break;
 		}
 		link->data.form_control = fc;
 		/* At this point, elformat.form might already be set but
diff --git a/src/viewer/text/form.c b/src/viewer/text/form.c
index f96673c2..82708db8 100644
--- a/src/viewer/text/form.c
+++ b/src/viewer/text/form.c
@@ -233,6 +233,8 @@ init_form_state(struct document_view *doc_view,
 			/* We don't want to recode hidden fields. */
 			fs->value = stracpy(fc->default_value);
 			break;
+		default:
+			break;
 	}
 }
 
@@ -655,6 +657,7 @@ drew_char:
 		case FC_RESET:
 		case FC_BUTTON:
 		case FC_HIDDEN:
+		default:
 			break;
 	}
 }
@@ -763,6 +766,9 @@ add_submitted_value_to_list(struct el_form_control *fc,
 		if (sub) add_to_list(*list, sub);
 
 		break;
+
+	default:
+		break;
 	}
 }
 
@@ -1938,6 +1944,8 @@ get_form_label(struct el_form_control *fc)
 		return N_("File upload");
 	case FC_PASSWORD:
 		return N_("Password field");
+	default:
+		break;
 	}
 
 	return NULL;
@@ -2075,6 +2083,7 @@ get_form_info(struct session *ses, struct document_view *doc_view)
 	case FC_RESET:
 	case FC_BUTTON:
 	case FC_SELECT:
+	default:
 		break;
 	}