diff --git a/py/builtin.c b/py/builtin.c
index b25ca42..d4b77d3 100644
--- a/py/builtin.c
+++ b/py/builtin.c
@@ -113,11 +113,13 @@
         } else {
             return o_in;
         }
+#if MICROPY_PY_BUILTINS_COMPLEX
     } else if (MP_OBJ_IS_TYPE(o_in, &mp_type_complex)) {
         mp_float_t real, imag;
         mp_obj_complex_get(o_in, &real, &imag);
         return mp_obj_new_float(MICROPY_FLOAT_C_FUN(sqrt)(real*real + imag*imag));
 #endif
+#endif
     } else {
         assert(0);
         return mp_const_none;
diff --git a/py/builtintables.c b/py/builtintables.c
index af9a9bc..66ea4ea 100644
--- a/py/builtintables.c
+++ b/py/builtintables.c
@@ -44,7 +44,7 @@
     { MP_OBJ_NEW_QSTR(MP_QSTR_bool), (mp_obj_t)&mp_type_bool },
     { MP_OBJ_NEW_QSTR(MP_QSTR_bytes), (mp_obj_t)&mp_type_bytes },
     { MP_OBJ_NEW_QSTR(MP_QSTR_bytearray), (mp_obj_t)&mp_type_bytearray },
-#if MICROPY_PY_BUILTINS_FLOAT
+#if MICROPY_PY_BUILTINS_COMPLEX
     { MP_OBJ_NEW_QSTR(MP_QSTR_complex), (mp_obj_t)&mp_type_complex },
 #endif
     { MP_OBJ_NEW_QSTR(MP_QSTR_dict), (mp_obj_t)&mp_type_dict },
diff --git a/py/mpconfig.h b/py/mpconfig.h
index 93e98c2..4a3288a 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -223,6 +223,10 @@
 #define MICROPY_PY_BUILTINS_FLOAT (0)
 #endif
 
+#ifndef MICROPY_PY_BUILTINS_COMPLEX
+#define MICROPY_PY_BUILTINS_COMPLEX (MICROPY_PY_BUILTINS_FLOAT)
+#endif
+
 // Enable features which improve CPython compatibility
 // but may lead to more code size/memory usage.
 // TODO: Originally intended as generic category to not
diff --git a/py/obj.c b/py/obj.c
index 6d0966d..a0f55d6 100644
--- a/py/obj.c
+++ b/py/obj.c
@@ -274,6 +274,7 @@
     }
 }
 
+#if MICROPY_PY_BUILTINS_COMPLEX
 void mp_obj_get_complex(mp_obj_t arg, mp_float_t *real, mp_float_t *imag) {
     if (arg == mp_const_false) {
         *real = 0;
@@ -297,6 +298,7 @@
     }
 }
 #endif
+#endif
 
 void mp_obj_get_array(mp_obj_t o, uint *len, mp_obj_t **items) {
     if (MP_OBJ_IS_TYPE(o, &mp_type_tuple)) {
diff --git a/py/objcomplex.c b/py/objcomplex.c
index d58b534..20e7c97 100644
--- a/py/objcomplex.c
+++ b/py/objcomplex.c
@@ -36,7 +36,7 @@
 #include "runtime0.h"
 #include "runtime.h"
 
-#if MICROPY_PY_BUILTINS_FLOAT
+#if MICROPY_PY_BUILTINS_COMPLEX
 
 #include <math.h>
 
diff --git a/py/objfloat.c b/py/objfloat.c
index b608b1a..e3fefad 100644
--- a/py/objfloat.c
+++ b/py/objfloat.c
@@ -102,9 +102,12 @@
 
 STATIC mp_obj_t float_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
     mp_obj_float_t *lhs = lhs_in;
+#if MICROPY_PY_BUILTINS_COMPLEX
     if (MP_OBJ_IS_TYPE(rhs_in, &mp_type_complex)) {
         return mp_obj_complex_binary_op(op, lhs->value, 0, rhs_in);
-    } else {
+    } else
+#endif
+    {
         return mp_obj_float_binary_op(op, lhs->value, rhs_in);
     }
 }
diff --git a/py/objint_mpz.c b/py/objint_mpz.c
index 516fb52..cf7896f 100644
--- a/py/objint_mpz.c
+++ b/py/objint_mpz.c
@@ -121,9 +121,11 @@
 #if MICROPY_PY_BUILTINS_FLOAT
     } else if (MP_OBJ_IS_TYPE(rhs_in, &mp_type_float)) {
         return mp_obj_float_binary_op(op, mpz_as_float(zlhs), rhs_in);
+#if MICROPY_PY_BUILTINS_COMPLEX
     } else if (MP_OBJ_IS_TYPE(rhs_in, &mp_type_complex)) {
         return mp_obj_complex_binary_op(op, mpz_as_float(zlhs), 0, rhs_in);
 #endif
+#endif
     } else {
         // delegate to generic function to check for extra cases
         return mp_obj_int_binary_op_extra_cases(op, lhs_in, rhs_in);
diff --git a/py/parsenum.c b/py/parsenum.c
index 1c1868a..36b0690 100644
--- a/py/parsenum.c
+++ b/py/parsenum.c
@@ -35,6 +35,7 @@
 #include "parsenumbase.h"
 #include "parsenum.h"
 #include "smallint.h"
+#include "runtime.h"
 
 #if MICROPY_PY_BUILTINS_FLOAT
 #include <math.h>
@@ -252,10 +253,15 @@
     }
 
     // return the object
+#if MICROPY_PY_BUILTINS_COMPLEX
     if (imag) {
         return mp_obj_new_complex(0, dec_val);
     } else if (force_complex) {
         return mp_obj_new_complex(dec_val, 0);
+#else
+    if (imag || force_complex) {
+        mp_not_implemented("complex values not supported");
+#endif
     } else {
         return mp_obj_new_float(dec_val);
     }
diff --git a/py/runtime.c b/py/runtime.c
index d57bb68..b539984 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -426,6 +426,7 @@
             } else {
                 return res;
             }
+#if MICROPY_PY_BUILTINS_COMPLEX
         } else if (MP_OBJ_IS_TYPE(rhs, &mp_type_complex)) {
             mp_obj_t res = mp_obj_complex_binary_op(op, lhs_val, 0, rhs);
             if (res == MP_OBJ_NULL) {
@@ -434,6 +435,7 @@
                 return res;
             }
 #endif
+#endif
         }
     }