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-rw-r--r--misc/qefgcvt.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/misc/qefgcvt.c b/misc/qefgcvt.c
index 2729dce786..853252cf78 100644
--- a/misc/qefgcvt.c
+++ b/misc/qefgcvt.c
@@ -20,6 +20,9 @@
 #define FLOAT_TYPE long double
 #define FUNC_PREFIX q
 #define FLOAT_FMT_FLAG "L"
-#define MAXDIG (LDBL_DIG + LDBL_MAX_10_EXP)
+/* Actually we have to write (LDBL_DIG + log10 (LDBL_MAX_10_EXP)) but
+   we don't have log10 available in the preprocessor.  Since we cannot
+   assume anything on the used `long double' format be generous.  */
+#define MAXDIG (LDBL_DIG + 12)
 
 #include "efgcvt.c"