diff --git a/libvmaf/meson.build b/libvmaf/meson.build
index cf20cecbd..a19893715 100644
--- a/libvmaf/meson.build
+++ b/libvmaf/meson.build
@@ -19,14 +19,8 @@ cc = meson.get_compiler('c')
 libvmaf_inc = include_directories(['include'])
 
 # Arguments in test_args will be used even on feature tests
-test_args = []
-if host_machine.system() == 'linux' or host_machine.system() == 'windows' or host_machine.system() == 'cygwin'
-    test_args += '-D_GNU_SOURCE'
-    add_project_arguments('-D_GNU_SOURCE', language: ['c', 'cpp'])
-elif host_machine.system() == 'darwin'
-    test_args += '-D_DARWIN_C_SOURCE'
-    add_project_arguments('-D_DARWIN_C_SOURCE', language: ['c', 'cpp'])
-endif
+test_args = ['-D_GNU_SOURCE', '-D_USE_MATH_DEFINES']
+add_project_arguments(test_args, language: ['c', 'cpp'])
 
 # Header checks
 stdatomic_dependency = []
diff --git a/libvmaf/src/feature/adm_tools.c b/libvmaf/src/feature/adm_tools.c
index 5278824e1..38925f4c4 100644
--- a/libvmaf/src/feature/adm_tools.c
+++ b/libvmaf/src/feature/adm_tools.c
@@ -28,10 +28,6 @@
 #include "adm_options.h"
 #include "adm_tools.h"
 
-#ifndef M_PI
-#define M_PI 3.1415926535897932384626433832795028841971693993751
-#endif
-
 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
 #define MAX(x, y) (((x) > (y)) ? (x) : (y))
 
diff --git a/libvmaf/src/feature/adm_tools.h b/libvmaf/src/feature/adm_tools.h
index 184d9ca04..af1c218c5 100644
--- a/libvmaf/src/feature/adm_tools.h
+++ b/libvmaf/src/feature/adm_tools.h
@@ -19,10 +19,6 @@
 #include <math.h>
 #include "common/macros.h"
 
-#ifndef M_PI
-#define M_PI 3.14159265358979323846264338327
-#endif
-
 #pragma once
 
 #ifndef ADM_TOOLS_H_
diff --git a/libvmaf/src/feature/integer_adm.h b/libvmaf/src/feature/integer_adm.h
index bf3836460..876d48bf9 100644
--- a/libvmaf/src/feature/integer_adm.h
+++ b/libvmaf/src/feature/integer_adm.h
@@ -60,10 +60,6 @@ typedef struct AdmBuffer {
 #define NUM_BUFS_ADM 30
 #endif
 
-#ifndef M_PI
-#define M_PI 3.14159265358979323846264338327
-#endif // M_PI
-
 /* Enhancement gain imposed on adm, must be >= 1.0, where 1.0 means the gain is completely disabled */
 #ifndef DEFAULT_ADM_ENHN_GAIN_LIMIT
 #define DEFAULT_ADM_ENHN_GAIN_LIMIT (100.0)
diff --git a/libvmaf/src/feature/integer_ssim.c b/libvmaf/src/feature/integer_ssim.c
index 418b71f71..f5bc5fe54 100644
--- a/libvmaf/src/feature/integer_ssim.c
+++ b/libvmaf/src/feature/integer_ssim.c
@@ -35,10 +35,6 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define KERNEL_WEIGHT (1<<KERNEL_SHIFT)
 #define KERNEL_ROUND ((1<<KERNEL_SHIFT)>>1)
 
-#ifndef M_PI
-#define M_PI 3.141592653589793238462643
-#endif
-
 static int gaussian_filter_init(unsigned **_kernel,double _sigma,int _max_len){
   unsigned *kernel;
   double    scale;