diff --git a/qpms/qpms_types.h b/qpms/qpms_types.h
index 1d8f7dd..e0b0b4f 100644
--- a/qpms/qpms_types.h
+++ b/qpms/qpms_types.h
@@ -9,13 +9,16 @@
 #include <stdint.h>
 
 #ifndef M_PI_2
-#define M_PI_2 (1.570796326794896619231321691639751442098584699687552910487)
+#define M_PI_2 (1.570796326794896619231321691639751442098584699687552910487L)
 #endif
 #ifndef M_PI
-#define M_PI (3.14159265358979323846)
+#define M_PI (3.14159265358979323846264338327950288419716939937510582097494L)
 #endif
 #ifndef M_SQRT2
-#define M_SQRT2 (1.4142135623730950488)
+#define M_SQRT2 (1.41421356237309504880168872420969807856967187537694807317668L)
+#endif
+#ifndef M_SQRTPI
+#define M_SQRTPI (1.77245385090551602729816748334114518279754945612238712821381L)
 #endif
 
 // integer index types