diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index b8efad6b2..db4a36b6b 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,9 @@
+2007-09-07  Jeff Johnston  <jjohnstn@redhat.com>
+
+	* libc/include/math.h (_M_LOG2E): Replace with..
+	(_M_LOG2_E): New macro.
+	(log2, log2f, M_LOG2_E): Use _M_LOG2_E.
+
 2007-09-06  Brian Dessent  <brian@dessent.net>
 
 	* libc/reent/getreent.c: Allow for case where __getreent is
diff --git a/newlib/libc/include/math.h b/newlib/libc/include/math.h
index 2bf35515f..9f9fe1b18 100644
--- a/newlib/libc/include/math.h
+++ b/newlib/libc/include/math.h
@@ -26,9 +26,8 @@ union __ldmath
   _LONG_DOUBLE ld;
 };
 
-/* Log2 of e */
-#define _M_LOG2E		1.4426950408889634074
-
+/* Natural log of 2 */
+#define _M_LOG2_E        0.693147180559945309417
 
 #if defined(__GNUC__) && \
   ( (__GNUC__ >= 4) || \
@@ -250,7 +249,7 @@ extern double gamma _PARAMS((double));
 extern double lgamma _PARAMS((double));
 extern double erf _PARAMS((double));
 extern double erfc _PARAMS((double));
-#define log2(x) (log (x) / _M_LOG2E)
+#define log2(x) (log (x) / _M_LOG2_E)
 
 #ifndef __math_68881
 extern double hypot _PARAMS((double, double));
@@ -327,7 +326,7 @@ extern float gammaf _PARAMS((float));
 extern float lgammaf _PARAMS((float));
 extern float erff _PARAMS((float));
 extern float erfcf _PARAMS((float));
-#define log2f(x) (logf (x) / (float) _M_LOG2E)
+#define log2f(x) (logf (x) / (float) _M_LOG2_E)
 extern float hypotf _PARAMS((float, float));
 #endif /* ! defined (_REENT_ONLY) */
 
@@ -424,7 +423,7 @@ extern int matherr _PARAMS((struct exception *e));
 #define MAXFLOAT	3.40282347e+38F
 
 #define M_E		2.7182818284590452354
-#define M_LOG2E		_M_LOG2E
+#define M_LOG2E		1.4426950408889634074
 #define M_LOG10E	0.43429448190325182765
 #define M_LN2		0.69314718055994530942
 #define M_LN10		2.30258509299404568402
@@ -443,7 +442,7 @@ extern int matherr _PARAMS((struct exception *e));
 #define M_LN2HI         6.9314718036912381649E-1
 #define M_SQRT3	1.73205080756887719000
 #define M_IVLN10        0.43429448190325182765 /* 1 / log(10) */
-#define M_LOG2_E        0.693147180559945309417
+#define M_LOG2_E        _M_LOG2_E
 #define M_INVLN2        1.4426950408889633870E0  /* 1 / log(2) */
 
 /* Global control over fdlibm error handling.  */