diff --git a/src/platform/dwarf.hpp b/src/platform/dwarf.hpp
index b1058d1..c574450 100644
--- a/src/platform/dwarf.hpp
+++ b/src/platform/dwarf.hpp
@@ -153,7 +153,7 @@ namespace libdwarf {
             }
         }
 
-        optional<uint64_t> get_unsigned_attribute(Dwarf_Half attr_num) const {
+        optional<Dwarf_Unsigned> get_unsigned_attribute(Dwarf_Half attr_num) const {
             Dwarf_Attribute attr;
             if(wrap(dwarf_attr, die, attr_num, &attr) == DW_DLV_OK) {
                 auto attwrapper = raii_wrap(attr, [] (Dwarf_Attribute attr) { dwarf_dealloc_attribute(attr); });
diff --git a/src/symbols/symbols_with_libdwarf.cpp b/src/symbols/symbols_with_libdwarf.cpp
index 8b053e4..2414c43 100644
--- a/src/symbols/symbols_with_libdwarf.cpp
+++ b/src/symbols/symbols_with_libdwarf.cpp
@@ -298,6 +298,7 @@ namespace libdwarf {
                     return subprogram_symbol(spec, 0, dwversion);
                 }
             }
+            return "";
         }
 
         void get_inlines_info(
@@ -317,7 +318,7 @@ namespace libdwarf {
                             const auto file = ""; // die.get_string_attribute(DW_AT_call_file);
                             const auto line = die.get_unsigned_attribute(DW_AT_call_line);
                             const auto col = die.get_unsigned_attribute(DW_AT_call_column);
-                            printf("  %s %s:%u:%u\n", name.c_str(), file, line.value_or(0), col.value_or(0));
+                            printf("  %s %s:%u:%u\n", name.c_str(), file, (unsigned)line.value_or(0), (unsigned)col.value_or(0));
                             inlines.push_back(stacktrace_frame{
                                 0,
                                 (unsigned int)line.value_or(0),