diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
index 278bf25025d64e1b6375e1b2a57ab5e2b3306246..8c0828fcb39e6e0e742309913eef1aa955e582e5 100644
--- a/src/internal/floatscan.c
+++ b/src/internal/floatscan.c
@@ -33,9 +33,6 @@
 
 #define MASK (KMAX-1)
 
-#define CONCAT2(x,y) x ## y
-#define CONCAT(x,y) CONCAT2(x,y)
-
 static long long scanexp(FILE *f, int pok)
 {
 	int c;
@@ -301,7 +298,7 @@ static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int po
 	y -= bias;
 
 	if ((e2+LDBL_MANT_DIG & INT_MAX) > emax-5) {
-		if (fabs(y) >= CONCAT(0x1p, LDBL_MANT_DIG)) {
+		if (fabsl(y) >= 2/LDBL_EPSILON) {
 			if (denormal && bits==LDBL_MANT_DIG+e2-emin)
 				denormal = 0;
 			y *= 0.5;