diff --git a/include/cyclone/runtime.h b/include/cyclone/runtime.h
index a71be75b..eb6ae077 100644
--- a/include/cyclone/runtime.h
+++ b/include/cyclone/runtime.h
@@ -526,6 +526,7 @@ object Cyc_num_cmp_va_list(void *data, int argc,
                            va_list ns);
 void Cyc_expt(void *data, object cont, object x, object y);
 void Cyc_remainder(void *data, object cont, object num1, object num2);
+void Cyc_get_ratio(void *data, object cont, object n, int numerator);
 object Cyc_number2string2(void *data, object cont, int argc, object n, ...);
 object Cyc_integer2char(void *data, object n);
 object Cyc_sum_op(void *data, common_type * x, object y);
diff --git a/runtime.c b/runtime.c
index d17b3749..b40dea56 100644
--- a/runtime.c
+++ b/runtime.c
@@ -8393,7 +8393,7 @@ void init_polyfills(void)
 // WIP - testing numerator/denominator computation
 // Code from https://stackoverflow.com/a/51142807/101258
 // Return error flag
-int split(double x, double *numerator, double *denominator) {
+int num2ratio(double x, double *numerator, double *denominator) {
   if (!isfinite(x)) {
     *numerator = *denominator = 0.0;
     if (x > 0.0) *numerator = 1.0;
@@ -8425,3 +8425,31 @@ int split(double x, double *numerator, double *denominator) {
   }
   return 0;
 }
+
+void Cyc_get_ratio(void *data, object cont, object n, int numerator)
+{
+  double d = 0.0;
+  Cyc_check_num(data, n);
+
+  if (obj_is_int(n)) {
+    d = (double)obj_obj2int(n);
+  } else if (type_of(n) == double_tag) {
+    d = double_value(n);
+  } else if (type_of(n) == bignum_tag) {
+    d = mp_get_double(&bignum_value(n));
+  } else {
+    Cyc_rt_raise2(data, "Unable to convert to ratio", n);
+  }
+
+  {
+    double numer, denom;
+    make_double(val, 0.0);
+    num2ratio(d, &numer, &denom);
+    if (numerator) {
+      double_value(&val) = numer;
+    } else {
+      double_value(&val) = denom;
+    }
+    return_closcall1(data, cont, &val);
+  }
+}
diff --git a/scheme/base.sld b/scheme/base.sld
index ee5b26f1..75bfe76a 100644
--- a/scheme/base.sld
+++ b/scheme/base.sld
@@ -196,6 +196,8 @@
     string->utf8
     denominator
     numerator
+    ;denominator2
+    ;numerator2
     parameterize
     read-bytevector
     read-bytevector!
@@ -1488,6 +1490,13 @@
   ;; Placeholders
   (define (denominator n) 1)
   (define (numerator n) n)
+  (define-c numerator2
+    "(void *data, int argc, closure _, object k, object n)"
+    " Cyc_get_ratio(data, k, n, 1);")
+
+  (define-c denominator2
+    "(void *data, int argc, closure _, object k, object n)"
+    " Cyc_get_ratio(data, k, n, 0);")
 
   (define (quotient x y)
     (truncate (/ x y)))