diff --git a/src/spicelib/devices/isrc/CUSPICE/cuisrcload.cu b/src/spicelib/devices/isrc/CUSPICE/cuisrcload.cu
index 4cf835af2..fde1bcf97 100644
--- a/src/spicelib/devices/isrc/CUSPICE/cuisrcload.cu
+++ b/src/spicelib/devices/isrc/CUSPICE/cuisrcload.cu
@@ -27,6 +27,10 @@
 #include "ngspice/CUSPICE/cuniinteg.cuh"
 #include "isrcdefs.h"
 
+#ifndef M_PI
+# define M_PI       3.14159265358979323846
+#endif
+
 #ifdef XSPICE_EXP
 /* gtri - begin - wbk - modify for supply ramping option */
 #include "ngspice/cmproto.h"
diff --git a/src/spicelib/devices/vsrc/CUSPICE/cuvsrcload.cu b/src/spicelib/devices/vsrc/CUSPICE/cuvsrcload.cu
index 387aa7752..7a2f88b0a 100644
--- a/src/spicelib/devices/vsrc/CUSPICE/cuvsrcload.cu
+++ b/src/spicelib/devices/vsrc/CUSPICE/cuvsrcload.cu
@@ -27,6 +27,9 @@
 #include "ngspice/CUSPICE/cuniinteg.cuh"
 #include "vsrcdefs.h"
 
+#ifndef M_PI
+# define M_PI       3.14159265358979323846
+#endif
 
 
 /*** STUFF NEEDED BECAUSE OF SOME INCLUSIONS IN NGSPICE THAT ARE NOT AVAILABLE IN CUDA ***/