diff --git a/arch/h8300/include/asm/posix_types.h b/arch/h8300/include/asm/posix_types.h
index 5c55392..6f833a1 100644
--- a/arch/h8300/include/asm/posix_types.h
+++ b/arch/h8300/include/asm/posix_types.h
@@ -50,7 +50,7 @@
 #define	__FD_CLR(d, set)	((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d))
 
 #undef	__FD_ISSET
-#define	__FD_ISSET(d, set)	((set)->fds_bits[__FDELT(d)] & __FDMASK(d))
+#define	__FD_ISSET(d, set)	(!!((set)->fds_bits[__FDELT(d)] & __FDMASK(d)))
 
 #undef	__FD_ZERO
 #define __FD_ZERO(fdsetp) (memset (fdsetp, 0, sizeof(*(fd_set *)fdsetp)))
diff --git a/arch/m68k/include/asm/posix_types.h b/arch/m68k/include/asm/posix_types.h
index 63cdcc1..98d0970 100644
--- a/arch/m68k/include/asm/posix_types.h
+++ b/arch/m68k/include/asm/posix_types.h
@@ -51,7 +51,7 @@
 #define	__FD_CLR(d, set)	((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d))
 
 #undef	__FD_ISSET
-#define	__FD_ISSET(d, set)	((set)->fds_bits[__FDELT(d)] & __FDMASK(d))
+#define	__FD_ISSET(d, set)	(!!((set)->fds_bits[__FDELT(d)] & __FDMASK(d)))
 
 #undef	__FD_ZERO
 #define __FD_ZERO(fdsetp) (memset (fdsetp, 0, sizeof(*(fd_set *)fdsetp)))
diff --git a/arch/xtensa/include/asm/posix_types.h b/arch/xtensa/include/asm/posix_types.h
index 43f9dd1..6b2190c 100644
--- a/arch/xtensa/include/asm/posix_types.h
+++ b/arch/xtensa/include/asm/posix_types.h
@@ -58,7 +58,7 @@
 
 #define	__FD_SET(d, set)	((set)->fds_bits[__FDELT(d)] |= __FDMASK(d))
 #define	__FD_CLR(d, set)	((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d))
-#define	__FD_ISSET(d, set)	((set)->fds_bits[__FDELT(d)] & __FDMASK(d))
+#define	__FD_ISSET(d, set)	(!!((set)->fds_bits[__FDELT(d)] & __FDMASK(d)))
 #define	__FD_ZERO(set)	\
   ((void) memset ((void *) (set), 0, sizeof (__kernel_fd_set)))