diff --git a/extmod/moduheapq.c b/extmod/moduheapq.c
index 8112b55255..5c5ed06a1f 100644
--- a/extmod/moduheapq.c
+++ b/extmod/moduheapq.c
@@ -24,8 +24,6 @@
  * THE SOFTWARE.
  */
 
-#include <unistd.h>
-
 #include "py/nlr.h"
 #include "py/objlist.h"
 #include "py/runtime0.h"
diff --git a/extmod/modujson.c b/extmod/modujson.c
index b5384bbc4e..747a86ac6a 100644
--- a/extmod/modujson.c
+++ b/extmod/modujson.c
@@ -25,8 +25,6 @@
  */
 
 #include <stdio.h>
-#include <unistd.h>
-#include <string.h>
 
 #include "py/nlr.h"
 #include "py/objlist.h"
diff --git a/extmod/moduzlib.c b/extmod/moduzlib.c
index 8b72d14ac4..31544059e8 100644
--- a/extmod/moduzlib.c
+++ b/extmod/moduzlib.c
@@ -25,11 +25,6 @@
  */
 
 #include <stdio.h>
-#include <unistd.h>
-#include <string.h>
-#include <time.h>
-#include <sys/time.h>
-#include <math.h>
 
 #include "py/nlr.h"
 #include "py/runtime.h"
diff --git a/py/compile.c b/py/compile.c
index d95d8f73bc..6c54ddeb83 100644
--- a/py/compile.c
+++ b/py/compile.c
@@ -29,7 +29,6 @@
 #include <stdio.h>
 #include <string.h>
 #include <assert.h>
-#include <math.h>
 
 #include "py/scope.h"
 #include "py/emit.h"
diff --git a/py/objfloat.c b/py/objfloat.c
index 2e8b7f74e9..b94caf3c06 100644
--- a/py/objfloat.c
+++ b/py/objfloat.c
@@ -28,7 +28,6 @@
 #include <stdio.h>
 #include <string.h>
 #include <assert.h>
-#include <math.h>
 
 #include "py/nlr.h"
 #include "py/parsenum.h"
@@ -37,6 +36,8 @@
 
 #if MICROPY_PY_BUILTINS_FLOAT
 
+#include <math.h>
+
 #if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
 #include "py/formatfloat.h"
 #endif