diff --git a/C/parser.c b/C/parser.c
index c6fe79b0b..a879d2aee 100755
--- a/C/parser.c
+++ b/C/parser.c
@@ -672,14 +672,6 @@ ParseList(read_data *rd, JMPBUFF *FailBuff USES_REGS)
   return (o);
 }
 
-#ifndef INFINITY
-#define INFINITY (1.0/0.0)
-#endif
-
-#ifndef NAN
-#define NAN      (0.0/0.0)
-#endif
-
 static Term
 ParseTerm(read_data *rd, int prio, JMPBUFF *FailBuff USES_REGS)
 {
diff --git a/H/eval.h b/H/eval.h
index 143dce452..78f6a2c1b 100644
--- a/H/eval.h
+++ b/H/eval.h
@@ -138,6 +138,14 @@ exceptions:
 #define PLMAXINT Int_MAX
 #define PLMININT Int_MIN
 
+#ifndef INFINITY
+#define INFINITY (1.0/0.0)
+#endif
+
+#ifndef NAN
+#define NAN      (0.0/0.0)
+#endif
+
 /**
  * @addtogroup arithmetic_operators
  * @enum arith0_op constant operators