diff --git a/lib/libc/amd64/_fpmath.h b/lib/libc/amd64/_fpmath.h
index 8f8cf6fb8075..c2a73848d6a1 100644
--- a/lib/libc/amd64/_fpmath.h
+++ b/lib/libc/amd64/_fpmath.h
@@ -36,6 +36,11 @@ union IEEEl2bits {
 		unsigned int	junkl	:16;
 		unsigned int	junkh	:32;
 	} bits;
+	struct {
+		unsigned long	man	:64;
+		unsigned int	expsign	:16;
+		unsigned long	junk	:48;
+	} xbits;
 };
 
 #define	LDBL_NBIT	0x80000000
@@ -47,4 +52,4 @@ union IEEEl2bits {
 #define	LDBL_TO_ARRAY32(u, a) do {			\
 	(a)[0] = (uint32_t)(u).bits.manl;		\
 	(a)[1] = (uint32_t)(u).bits.manh;		\
-} while(0)
+} while (0)
diff --git a/lib/libc/i386/_fpmath.h b/lib/libc/i386/_fpmath.h
index 80e764f8eacf..4f1f5f4a5a16 100644
--- a/lib/libc/i386/_fpmath.h
+++ b/lib/libc/i386/_fpmath.h
@@ -35,6 +35,11 @@ union IEEEl2bits {
 		unsigned int	sign	:1;
 		unsigned int	junk	:16;
 	} bits;
+	struct {
+		unsigned long long man	:64;
+		unsigned int 	expsign	:16;
+		unsigned int	junk	:16;
+	} xbits;
 };
 
 #define	LDBL_NBIT	0x80000000
@@ -46,4 +51,4 @@ union IEEEl2bits {
 #define	LDBL_TO_ARRAY32(u, a) do {			\
 	(a)[0] = (uint32_t)(u).bits.manl;		\
 	(a)[1] = (uint32_t)(u).bits.manh;		\
-} while(0)
+} while (0)
diff --git a/lib/libc/ia64/_fpmath.h b/lib/libc/ia64/_fpmath.h
index 7f24e768ff2d..936ce23b6ef3 100644
--- a/lib/libc/ia64/_fpmath.h
+++ b/lib/libc/ia64/_fpmath.h
@@ -46,6 +46,17 @@ union IEEEl2bits {
 		unsigned int	manl	:32;
 #endif
 	} bits;
+	struct {
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+		unsigned long	man	:64;
+		unsigned int	expsign	:16;
+		unsigned long	junk	:48;
+#else /* _BIG_ENDIAN */
+		unsigned long	junk	:48;
+		unsigned int	expsign	:16;
+		unsigned long	man	:64;
+#endif
+	} xbits;
 };
 
 #if _BYTE_ORDER == _LITTLE_ENDIAN
@@ -68,4 +79,4 @@ union IEEEl2bits {
 #define	LDBL_TO_ARRAY32(u, a) do {			\
 	(a)[0] = (uint32_t)(u).bits.manl;		\
 	(a)[1] = (uint32_t)(u).bits.manh;		\
-} while(0)
+} while (0)