diff --git a/SLS_C/src/builtin.c b/SLS_C/src/builtin.c
index 0b08986..eee6133 100644
--- a/SLS_C/src/builtin.c
+++ b/SLS_C/src/builtin.c
@@ -1014,8 +1014,8 @@ Boolean builtin_bitxor(InterpreterState *interpreter_state) {
 }
 
 Boolean builtin_ceil(InterpreterState *interpreter_state) {
-    (void)interpreter_state;
-    return FALSE;
+    NUMERIC_TYPE;
+    FLOAT_FUNCTION(ceil);
 }
 
 Boolean builtin_cos(InterpreterState *interpreter_state) {
@@ -1056,8 +1056,8 @@ Boolean builtin_eval(InterpreterState *interpreter_state) {
 }
 
 Boolean builtin_floor(InterpreterState *interpreter_state) {
-    (void)interpreter_state;
-    return FALSE;
+    NUMERIC_TYPE;
+    FLOAT_FUNCTION(floor);
 }
 
 Boolean builtin_for(InterpreterState *interpreter_state) {
@@ -1140,8 +1140,8 @@ Boolean builtin_rot(InterpreterState *interpreter_state) {
 }
 
 Boolean builtin_round(InterpreterState *interpreter_state) {
-    (void)interpreter_state;
-    return FALSE;
+    NUMERIC_TYPE;
+    FLOAT_FUNCTION(round);
 }
 
 Boolean builtin_seed(InterpreterState *interpreter_state) {