diff --git a/c_src/sqlite3_drv.c b/c_src/sqlite3_drv.c
index a09fbef..525a13c 100644
--- a/c_src/sqlite3_drv.c
+++ b/c_src/sqlite3_drv.c
@@ -246,12 +246,16 @@ static inline int output_ok(sqlite3_drv_t *drv) {
   return driver_output_term(drv->port, spec, sizeof(spec) / sizeof(spec[0]));
 }
 
-static int enable_load_extension(sqlite3_drv_t* drv, char *buf,
-    int len) {
+static int enable_load_extension(sqlite3_drv_t* drv, char *buf, int len) {
+#ifdef ERLANG_SQLITE3_LOAD_EXTENSION
   char enable = buf[0];
   sqlite3_enable_load_extension(drv->db, (int) enable);
   output_ok(drv);
   return 0;
+#else
+  output_error(drv, SQLITE_MISUSE, "extension loading not enabled");
+  return -1;
+#endif
 }
 
 static inline async_sqlite3_command *make_async_command_statement(
@@ -1415,7 +1419,7 @@ static void fprint_dataset(FILE* log, ErlDrvTermData *dataset, int term_count) {
 #if defined(_MSC_VER)
       fprintf(log, "%d-%d: int %I64d", i, i+1, (ErlDrvSInt64) dataset[i+1]);
 #else
-      fprintf(log, "%d-%d: int %ld", i, i+1, (ErlDrvSInt64) dataset[i+1]);
+      fprintf(log, "%d-%d: int %lld", i, i+1, (ErlDrvSInt64) dataset[i+1]);
 #endif
       i += 2;
       stack_size++;
@@ -1424,7 +1428,7 @@ static void fprint_dataset(FILE* log, ErlDrvTermData *dataset, int term_count) {
 #if defined(_MSC_VER)
       fprintf(log, "%d-%d: int %I64lu", i, i+1, (ErlDrvUInt64) dataset[i+1]);
 #else
-      fprintf(log, "%d-%d: int %lu", i, i+1, (ErlDrvUInt64) dataset[i+1]);
+      fprintf(log, "%d-%d: int %llu", i, i+1, (ErlDrvUInt64) dataset[i+1]);
 #endif
       i += 2;
       stack_size++;
diff --git a/src/sqlite3_lib.erl b/src/sqlite3_lib.erl
index bb6b796..3e4655d 100644
--- a/src/sqlite3_lib.erl
+++ b/src/sqlite3_lib.erl
@@ -304,11 +304,11 @@ sql_number(NumberStr) ->
     case string:to_integer(NumberStr) of
         {Int, []} -> 
             Int;
-        Other -> 
+        _ ->
             case string:to_float(NumberStr) of
                 {Float, []} ->
                     Float;
-                Other ->
+                _ ->
                     {error, not_a_number}
             end
     end.
@@ -408,6 +408,17 @@ quote_test() ->
     ?assertFlat("'abc'", value_to_sql("abc")),
     ?assertFlat("'a''b''''c'", value_to_sql("a'b''c")).
 
+number_test() ->
+    ?assertEqual(sql_number(""),    {error, not_a_number}),
+    ?assertEqual(sql_number("a"),   {error, not_a_number}),
+    ?assertEqual(sql_number(" 1"),  {error, not_a_number}),
+    ?assertEqual(sql_number("1 "),  {error, not_a_number}),
+    ?assertEqual(sql_number(" 1 "), {error, not_a_number}),
+    ?assertEqual(sql_number("0"),   0),
+    ?assertEqual(sql_number("0.0"), 0.0),
+    ?assertEqual(sql_number("-0.0"), 0.0),
+    ?assertEqual(sql_number("+0.0"), 0.0).
+
 create_table_sql_test() ->
     ?assertFlat(
         "CREATE TABLE user (id INTEGER PRIMARY KEY, name TEXT, CHECK ('am'='am'));",