diff --git a/c_src/betree.c b/c_src/betree.c
index c3b1563..08c385e 100644
--- a/c_src/betree.c
+++ b/c_src/betree.c
@@ -768,6 +768,18 @@ static ERL_NIF_TERM nif_betree_make(ErlNifEnv* env, int argc, const ERL_NIF_TERM
     return retval;
 }
 
+// Make sure that clock_gettime will work correctly on different Linux flavors.
+int reverse_get_clock_type(int ct) {
+	int res = CLOCK_MONOTONIC;
+	switch (ct) {
+		case 0 : res = CLOCK_REALTIME; break;
+		case 1 : res = CLOCK_MONOTONIC; break;
+		case 2 : res = CLOCK_PROCESS_CPUTIME_ID; break;
+		case 3 : res = CLOCK_THREAD_CPUTIME_ID; break;
+	}
+	return res;
+}
+
 static ERL_NIF_TERM nif_betree_make_event(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {
     ERL_NIF_TERM retval;
@@ -783,6 +795,7 @@ static ERL_NIF_TERM nif_betree_make_event(ErlNifEnv* env, int argc, const ERL_NI
     if (!enif_get_int(env, argv[2], &clock_type)) {
         return enif_make_badarg(env);
     }
+    clock_type = reverse_get_clock_type(clock_type);
     struct timespec start, done;
     clock_gettime(clock_type, &start);
 
@@ -1055,10 +1068,11 @@ static ERL_NIF_TERM nif_betree_search_t(ErlNifEnv* env, int argc, const ERL_NIF_
         return enif_make_badarg(env);
     }
 
-    int clock_type;
+    int clock_type = 0;
     if (!enif_get_int(env, argv[2], &clock_type)) {
 	    return enif_make_badarg(env);
     }
+    clock_type = reverse_get_clock_type(clock_type);
     struct timespec start, done;
     clock_gettime(clock_type, &start);
     ERL_NIF_TERM search_res = nif_betree_search(env, argc - 1, argv);
@@ -1085,6 +1099,7 @@ static ERL_NIF_TERM nif_betree_search_evt(ErlNifEnv* env, int argc, const ERL_NI
     if (!enif_get_int(env, argv[2], &clock_type)) {
 	    return enif_make_badarg(env);
     }
+    clock_type = reverse_get_clock_type(clock_type);
     struct timespec start, done;
     clock_gettime(clock_type, &start);
 
@@ -1136,6 +1151,7 @@ static ERL_NIF_TERM nif_betree_search_evt_ids(ErlNifEnv* env, int argc, const ER
     if (!enif_get_int(env, argv[3], &clock_type)) {
 	    return enif_make_badarg(env);
     }
+    clock_type = reverse_get_clock_type(clock_type);
     struct timespec start, done;
     clock_gettime(clock_type, &start);
 
@@ -1217,6 +1233,7 @@ static ERL_NIF_TERM nif_betree_search_ids(ErlNifEnv* env, int argc, const ERL_NI
     if (!enif_get_int(env, argv[3], &clock_type)) {
 	    return enif_make_badarg(env);
     }
+    clock_type = reverse_get_clock_type(clock_type);
     struct timespec start, done;
     clock_gettime(clock_type, &start);
 
diff --git a/src/erl_betree.erl b/src/erl_betree.erl
index 4cda8d0..d0add44 100644
--- a/src/erl_betree.erl
+++ b/src/erl_betree.erl
@@ -18,22 +18,21 @@
     search_iterator_release/1
 ]).
 
--inline([check_clock_type/1]).
 
--define(CLOCK_REALTIME, 0). 
--define(CLOCK_MONOTONIC, 6). 
--define(CLOCK_PROCESS_CPUTIME_ID, 12). 
--define(CLOCK_THREAD_CPUTIME_ID, 16). 
+% -define(CLOCK_REALTIME, 0). 
+-define(CLOCK_MONOTONIC, 1). 
+% -define(CLOCK_PROCESS_CPUTIME_ID, 2). 
+% -define(CLOCK_THREAD_CPUTIME_ID, 3). 
 
 betree_make(Domains) ->
     erl_betree_nif:betree_make(Domains).
 betree_make_event(Betree, Event) ->
     betree_make_event(Betree, Event, ?CLOCK_MONOTONIC).
 
-betree_make_event({_, Betree}, Event, CLockType) ->
-    erl_betree_nif:betree_make_event(Betree, Event, check_clock_type(CLockType));
-betree_make_event(Betree, Event, CLockType) ->
-    erl_betree_nif:betree_make_event(Betree, Event, check_clock_type(CLockType)).
+betree_make_event({_, Betree}, Event, ClockType) when is_integer(ClockType) ->
+    erl_betree_nif:betree_make_event(Betree, Event, ClockType);
+betree_make_event(Betree, Event, ClockType) when is_integer(ClockType) ->
+    erl_betree_nif:betree_make_event(Betree, Event, ClockType).
 betree_make_sub(Betree, SubId, Constants, Expr) ->
     erl_betree_nif:betree_make_sub(Betree, SubId, Constants, Expr).
 betree_insert_sub(Betree, Sub) ->
@@ -45,10 +44,10 @@ betree_search(Betree, Event) ->
 
 % @doc Calculates time spend in NIF. 
 % Time value is in microseconds - the erlang:timestamp resolution.  
-betree_search(Betree, Event, CLockType) when is_list(Event) ->
-    erl_betree_nif:betree_search(Betree, Event, check_clock_type(CLockType));
-betree_search(Betree, Event, CLockType) when is_reference(Event) ->
-    erl_betree_nif:betree_search_evt(Betree, Event, check_clock_type(CLockType)).
+betree_search(Betree, Event, ClockType) when is_list(Event), is_integer(ClockType) ->
+    erl_betree_nif:betree_search(Betree, Event, ClockType);
+betree_search(Betree, Event, ClockType) when is_reference(Event), is_integer(ClockType) ->
+    erl_betree_nif:betree_search_evt(Betree, Event, ClockType).
 
 betree_write_dot(Betree, FileName) when is_list(FileName) ->
     erl_betree_nif:betree_write_dot(Betree, FileName).
@@ -61,15 +60,10 @@ betree_search_ids(Betree, Event, Ids) ->
 % Time value is in microseconds - the erlang:timestamp resolution.  
 betree_search_ids(_Betree, _Event, [], _CLockType)  ->
     {0, []};
-betree_search_ids(Betree, Event, Ids, CLockType) when is_list(Event) ->
-    erl_betree_nif:betree_search_ids(Betree, Event, Ids, check_clock_type(CLockType));
-betree_search_ids(Betree, Event, Ids, CLockType) when is_reference(Event) ->
-    erl_betree_nif:betree_search_evt(Betree, Event, Ids, check_clock_type(CLockType)).
-
-check_clock_type(?CLOCK_REALTIME) -> ?CLOCK_REALTIME;
-check_clock_type(?CLOCK_PROCESS_CPUTIME_ID) -> ?CLOCK_PROCESS_CPUTIME_ID;
-check_clock_type(?CLOCK_THREAD_CPUTIME_ID) -> ?CLOCK_THREAD_CPUTIME_ID;
-check_clock_type(_) -> ?CLOCK_MONOTONIC.
+betree_search_ids(Betree, Event, Ids, ClockType) when is_list(Event), is_integer(ClockType) ->
+    erl_betree_nif:betree_search_ids(Betree, Event, Ids, ClockType);
+betree_search_ids(Betree, Event, Ids, ClockType) when is_reference(Event), is_integer(ClockType) ->
+    erl_betree_nif:betree_search_evt(Betree, Event, Ids, ClockType).
 
 search_iterator(Betree, Event) ->
     erl_betree_nif:search_iterator(Betree, Event).