diff --git a/src/gmisc/gmisc.h b/src/gmisc/gmisc.h
index 8f858682..ebef8156 100644
--- a/src/gmisc/gmisc.h
+++ b/src/gmisc/gmisc.h
@@ -75,7 +75,9 @@ typedef int32_t	fixed;
 /**
  * @brief   The famous number pi
  */
+#ifndef PI
 #define PI	3.1415926535897932384626433832795028841971693993751
+#endif
 
 /**
  * @brief   pi as a fixed point