diff --git a/man3/ecvt_r.3 b/man3/ecvt_r.3
index f56197782..05689c8fc 100644
--- a/man3/ecvt_r.3
+++ b/man3/ecvt_r.3
@@ -34,15 +34,17 @@ ecvt_r, fcvt_r, qecvt_r, qfcvt_r \- convert a floating-point number to a string
 .nf
 .B #include <stdlib.h>
 .PP
-.BI "int ecvt_r(double " number ", int " ndigits ", int *" decpt ,
-.BI "           int *" sign ", char *" buf ", size_t " len );
-.BI "int fcvt_r(double " number ", int " ndigits ", int *" decpt ,
-.BI "           int *" sign ", char *" buf ", size_t " len );
+.BI "int ecvt_r(double " number ", int " ndigits ", int *restrict " decpt ,
+.BI "           int *restrict " sign ", char *restrict " buf ", size_t " len );
+.BI "int fcvt_r(double " number ", int " ndigits ", int *restrict " decpt ,
+.BI "           int *restrict " sign ", char *restrict " buf ", size_t " len );
 .PP
-.BI "int qecvt_r(long double " number ", int " ndigits ", int *" decpt ,
-.BI "           int *" sign ", char *" buf ", size_t " len );
-.BI "int qfcvt_r(long double " number ", int " ndigits ", int *" decpt ,
-.BI "           int *" sign ", char *" buf ", size_t " len );
+.BI "int qecvt_r(long double " number ", int " ndigits \
+", int *restrict " decpt ,
+.BI "           int *restrict " sign ", char *restrict " buf ", size_t " len );
+.BI "int qfcvt_r(long double " number ", int " ndigits \
+", int *restrict " decpt ,
+.BI "           int *restrict " sign ", char *restrict " buf ", size_t " len );
 .fi
 .PP
 .RS -4