diff --git a/sys/powerpc/include/float.h b/sys/powerpc/include/float.h
index 369d0a0bfb16..ca6568f409e5 100644
--- a/sys/powerpc/include/float.h
+++ b/sys/powerpc/include/float.h
@@ -48,7 +48,7 @@ __END_DECLS
 #define FLT_RADIX	2		/* b */
 #if __ISO_C_VISIBLE >= 1999
 #define	FLT_EVAL_METHOD	1		/* operands promoted to double */
-#define	DECIMAL_DIG	35		/* max precision in decimal digits */
+#define	DECIMAL_DIG	17		/* max precision in decimal digits */
 #endif
 
 #define FLT_MANT_DIG	24		/* p */