diff --git a/ladspa-util.h b/ladspa-util.h
index 1369581..be7d082 100644
--- a/ladspa-util.h
+++ b/ladspa-util.h
@@ -7,6 +7,10 @@
 #ifndef LADSPA_UTIL_H
 #define LADSPA_UTIL_H
 
+#ifndef _USE_MATH_DEFINES
+#define _USE_MATH_DEFINES
+#endif
+
 #include <math.h>
 #include <stdint.h>
 
diff --git a/makestub.pl b/makestub.pl
index 99e2108..4d7cf84 100755
--- a/makestub.pl
+++ b/makestub.pl
@@ -81,6 +81,9 @@
 \#define         __USE_ISOC99    1
 \#define         __USE_ISOC9X    1
 
+\#ifndef _USE_MATH_DEFINES
+\#define _USE_MATH_DEFINES
+\#endif
 \#include <math.h>
 
 \#include "ladspa.h"
diff --git a/util/pitchscale.c b/util/pitchscale.c
index f443ced..b54b5a4 100644
--- a/util/pitchscale.c
+++ b/util/pitchscale.c
@@ -37,7 +37,6 @@
 
 #include <string.h>
 #include "../config.h"
-#include <math.h>
 
 #include "pitchscale.h"
 
diff --git a/util/pitchscale.h b/util/pitchscale.h
index 7ca6631..09f4f9f 100644
--- a/util/pitchscale.h
+++ b/util/pitchscale.h
@@ -3,6 +3,12 @@
 
 #include <config.h>
 
+#ifndef _USE_MATH_DEFINES
+#define _USE_MATH_DEFINES
+#endif
+
+#include <math.h>
+
 #ifdef FFTW3
 
 #include <fftw3.h>