diff --git a/src/asm/symbol.c b/src/asm/symbol.c
index a99703be..f75d041b 100644
--- a/src/asm/symbol.c
+++ b/src/asm/symbol.c
@@ -751,6 +751,8 @@ sym_PrepPass2(void)
 	sym_AddEqu("_NARG", 0);
 	p_NARGSymbol = findsymbol("_NARG", NULL);
 	p_NARGSymbol->Callback = Callback_NARG;
+	
+	math_DefinePI();
 }
 
 /*