diff --git a/src/ast.c b/src/ast.c
index df0feb616f745..101b32a023592 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -327,34 +327,48 @@ static jl_value_t *scm_to_julia_(value_t e, int eo)
             e = cdr_(e);
             if (!eo) {
                 if (sym == line_sym && n==2) {
-                    jl_value_t *filename = scm_to_julia_(car_(cdr_(e)),0);
-                    jl_value_t *linenum  = scm_to_julia_(car_(e),0);
+                    jl_value_t *filename = NULL, *linenum = NULL;
                     JL_GC_PUSH2(&filename, &linenum);
+                    filename = scm_to_julia_(car_(cdr_(e)),0);
+                    linenum  = scm_to_julia_(car_(e),0);
                     jl_value_t *temp = jl_new_struct(jl_linenumbernode_type,
                                                      filename, linenum);
                     JL_GC_POP();
                     return temp;
                 }
+                jl_value_t *scmv = NULL, *temp = NULL;
+                JL_GC_PUSH(&scmv);
                 if (sym == label_sym) {
-                    return jl_new_struct(jl_labelnode_type,
-                                         scm_to_julia_(car_(e),0));
+                    scmv = scm_to_julia_(car_(e),0);
+                    temp = jl_new_struct(jl_labelnode_type, scmv);
+                    JL_GC_POP();
+                    return temp;
                 }
                 if (sym == goto_sym) {
-                    return jl_new_struct(jl_gotonode_type,
-                                         scm_to_julia_(car_(e),0));
+                    scmv = scm_to_julia_(car_(e),0);
+                    temp = jl_new_struct(jl_gotonode_type, scmv);
+                    JL_GC_POP();
+                    return temp;
                 }
                 if (sym == inert_sym || (sym == quote_sym && (!iscons(car_(e))))) {
-                    return jl_new_struct(jl_quotenode_type,
-                                         scm_to_julia_(car_(e),0));
+                    scmv = scm_to_julia_(car_(e),0);
+                    temp = jl_new_struct(jl_quotenode_type, scmv);
+                    JL_GC_POP();
+                    return temp;
                 }
                 if (sym == top_sym) {
-                    return jl_new_struct(jl_topnode_type,
-                                         scm_to_julia_(car_(e),0));
+                    scmv = scm_to_julia_(car_(e),0);
+                    temp = jl_new_struct(jl_topnode_type, scmv);
+                    JL_GC_POP();
+                    return temp;
                 }
                 if (sym == newvar_sym) {
-                    return jl_new_struct(jl_newvarnode_type,
-                                         scm_to_julia_(car_(e),0));
+                    scmv = scm_to_julia_(car_(e),0);
+                    temp = jl_new_struct(jl_newvarnode_type, scmv);
+                    JL_GC_POP();
+                    return temp;
                 }
+                JL_GC_POP();
             }
             else if (sym == inert_sym && !iscons(car_(e))) {
                 sym = quote_sym;