diff --git a/lib/msun/src/catrig.c b/lib/msun/src/catrig.c
index cfc4dcf0aef0..ebfe3567c168 100644
--- a/lib/msun/src/catrig.c
+++ b/lib/msun/src/catrig.c
@@ -37,7 +37,7 @@ __FBSDID("$FreeBSD$");
 #define isinf(x)	(fabs(x) == INFINITY)
 #undef isnan
 #define isnan(x)	((x) != (x))
-#define	raise_inexact()	do { volatile float junk = 1 + tiny; } while(0)
+#define	raise_inexact()	do { volatile float junk __unused = 1 + tiny; } while(0)
 #undef signbit
 #define signbit(x)	(__builtin_signbit(x))
 
diff --git a/lib/msun/src/catrigf.c b/lib/msun/src/catrigf.c
index ca84ce2a99a8..3067d314b910 100644
--- a/lib/msun/src/catrigf.c
+++ b/lib/msun/src/catrigf.c
@@ -51,7 +51,7 @@ __FBSDID("$FreeBSD$");
 #define isinf(x)	(fabsf(x) == INFINITY)
 #undef isnan
 #define isnan(x)	((x) != (x))
-#define	raise_inexact()	do { volatile float junk = 1 + tiny; } while(0)
+#define	raise_inexact()	do { volatile float junk __unused = 1 + tiny; } while(0)
 #undef signbit
 #define signbit(x)	(__builtin_signbitf(x))
 
diff --git a/lib/msun/src/catrigl.c b/lib/msun/src/catrigl.c
index f71a3118de7e..41357e864456 100644
--- a/lib/msun/src/catrigl.c
+++ b/lib/msun/src/catrigl.c
@@ -53,7 +53,7 @@ __FBSDID("$FreeBSD$");
 #define isinf(x)	(fabsl(x) == INFINITY)
 #undef isnan
 #define isnan(x)	((x) != (x))
-#define	raise_inexact()	do { volatile float junk = 1 + tiny; } while(0)
+#define	raise_inexact()	do { volatile float junk __unused = 1 + tiny; } while(0)
 #undef signbit
 #define signbit(x)	(__builtin_signbitl(x))