diff --git a/src/_imaging.c b/src/_imaging.c
index 1201e8db7..b84784caf 100644
--- a/src/_imaging.c
+++ b/src/_imaging.c
@@ -85,8 +85,6 @@
 
 #include "libImaging/Imaging.h"
 
-#define _USE_MATH_DEFINES
-#include <math.h>
 #include <stddef.h>
 
 #undef VERBOSE
diff --git a/src/_imagingmath.c b/src/_imagingmath.c
index f54ca6cd5..1c60ad7f4 100644
--- a/src/_imagingmath.c
+++ b/src/_imagingmath.c
@@ -15,7 +15,6 @@
 
 #include "libImaging/Imaging.h"
 
-#include <math.h>
 #include <float.h>
 
 #define MAX_INT32 2147483647.0
diff --git a/src/libImaging/ColorLUT.c b/src/libImaging/ColorLUT.c
index 5559de689..33633f555 100644
--- a/src/libImaging/ColorLUT.c
+++ b/src/libImaging/ColorLUT.c
@@ -1,5 +1,4 @@
 #include "Imaging.h"
-#include <math.h>
 
 /* 8 bits for result. Table can overflow [0, 1.0] range,
    so we need extra bits for overflow and negative values.
diff --git a/src/libImaging/Draw.c b/src/libImaging/Draw.c
index 5c61e0e7e..730bba8ac 100644
--- a/src/libImaging/Draw.c
+++ b/src/libImaging/Draw.c
@@ -34,8 +34,6 @@
 
 #include "Imaging.h"
 
-#include <math.h>
-
 #define CEIL(v) (int)ceil(v)
 #define FLOOR(v) ((v) >= 0.0 ? (int)(v) : (int)floor(v))
 
diff --git a/src/libImaging/Effects.c b/src/libImaging/Effects.c
index 93e7af0bc..64d6188d9 100644
--- a/src/libImaging/Effects.c
+++ b/src/libImaging/Effects.c
@@ -17,8 +17,6 @@
 
 #include "Imaging.h"
 
-#include <math.h>
-
 Imaging
 ImagingEffectMandelbrot(int xsize, int ysize, double extent[4], int quality) {
     /* Generate a Mandelbrot set covering the given extent */
diff --git a/src/libImaging/Fill.c b/src/libImaging/Fill.c
index 8fb481e7e..1e4bb9ba0 100644
--- a/src/libImaging/Fill.c
+++ b/src/libImaging/Fill.c
@@ -17,8 +17,6 @@
 
 #include "Imaging.h"
 
-#include "math.h"
-
 Imaging
 ImagingFill(Imaging im, const void *colour) {
     int x, y;
diff --git a/src/libImaging/Imaging.h b/src/libImaging/Imaging.h
index 315ec4440..7ba809bf4 100644
--- a/src/libImaging/Imaging.h
+++ b/src/libImaging/Imaging.h
@@ -16,10 +16,6 @@
 extern "C" {
 #endif
 
-#ifndef M_PI
-#define M_PI 3.1415926535897932384626433832795
-#endif
-
 /* -------------------------------------------------------------------- */
 
 /*
diff --git a/src/libImaging/ImagingPlatform.h b/src/libImaging/ImagingPlatform.h
index 78d27067c..3a3875daf 100644
--- a/src/libImaging/ImagingPlatform.h
+++ b/src/libImaging/ImagingPlatform.h
@@ -10,6 +10,9 @@
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
+#define _USE_MATH_DEFINES
+#include <math.h>
+
 /* Check that we have an ANSI compliant compiler */
 #ifndef HAVE_PROTOTYPES
 #error Sorry, this library requires support for ANSI prototypes.
diff --git a/src/libImaging/Palette.c b/src/libImaging/Palette.c
index 78916bca5..032ce8ab2 100644
--- a/src/libImaging/Palette.c
+++ b/src/libImaging/Palette.c
@@ -18,8 +18,6 @@
 
 #include "Imaging.h"
 
-#include <math.h>
-
 ImagingPalette
 ImagingPaletteNew(const char *mode) {
     /* Create a palette object */
diff --git a/src/libImaging/Quant.c b/src/libImaging/Quant.c
index a489a882d..147d8ae52 100644
--- a/src/libImaging/Quant.c
+++ b/src/libImaging/Quant.c
@@ -1428,7 +1428,6 @@ quantize(
     }
 
 #ifdef TEST_NEAREST_NEIGHBOUR
-#include <math.h>
     {
         uint32_t bestmatch, bestdist, dist;
         HashTable *h2;
diff --git a/src/libImaging/Reduce.c b/src/libImaging/Reduce.c
index 022daa000..6da18d773 100644
--- a/src/libImaging/Reduce.c
+++ b/src/libImaging/Reduce.c
@@ -1,7 +1,5 @@
 #include "Imaging.h"
 
-#include <math.h>
-
 #define ROUND_UP(f) ((int)((f) >= 0.0 ? (f) + 0.5F : (f) - 0.5F))
 
 UINT32
diff --git a/src/libImaging/Resample.c b/src/libImaging/Resample.c
index f5e386dc2..978bf74c7 100644
--- a/src/libImaging/Resample.c
+++ b/src/libImaging/Resample.c
@@ -1,7 +1,5 @@
 #include "Imaging.h"
 
-#include <math.h>
-
 #define ROUND_UP(f) ((int)((f) >= 0.0 ? (f) + 0.5F : (f) - 0.5F))
 
 struct filter {
diff --git a/src/path.c b/src/path.c
index 53c1dd8c4..c9c2d61ef 100644
--- a/src/path.c
+++ b/src/path.c
@@ -28,8 +28,6 @@
 #include "libImaging/Imaging.h"
 #include "thirdparty/pythoncapi_compat.h"
 
-#include <math.h>
-
 /* compatibility wrappers (defined in _imaging.c) */
 extern int
 PyImaging_CheckBuffer(PyObject *buffer);