diff --git a/src/runtime/fds_unix.go b/src/runtime/fds_unix.go
index f39e6a49e9..7182ef0789 100644
--- a/src/runtime/fds_unix.go
+++ b/src/runtime/fds_unix.go
@@ -29,15 +29,6 @@ func checkfds() {
 			continue
 		}
 
-		// On AIX and Solaris we can't get the right errno
-		// value this early in program startup,
-		// because we haven't yet called minit
-		// which sets m.mOS.perrno.
-		// Just assume that the error is EBADF.
-		if GOOS == "aix" || GOOS == "solaris" {
-			errno = EBADF
-		}
-
 		if errno != EBADF {
 			print("runtime: unexpected error while checking standard file descriptor ", i, ", errno=", errno, "\n")
 			throw("cannot open standard fds")
diff --git a/src/runtime/os3_solaris.go b/src/runtime/os3_solaris.go
index 046d173c24..83acc648bb 100644
--- a/src/runtime/os3_solaris.go
+++ b/src/runtime/os3_solaris.go
@@ -133,6 +133,10 @@ func getPageSize() uintptr {
 }
 
 func osinit() {
+	// Call miniterrno so that we can safely make system calls
+	// before calling minit on m0.
+	asmcgocall(unsafe.Pointer(abi.FuncPCABI0(miniterrno)), unsafe.Pointer(&libc____errno))
+
 	ncpu = getncpu()
 	if physPageSize == 0 {
 		physPageSize = getPageSize()
diff --git a/src/runtime/os_aix.go b/src/runtime/os_aix.go
index 0583e9afdb..ce2d719d0b 100644
--- a/src/runtime/os_aix.go
+++ b/src/runtime/os_aix.go
@@ -93,6 +93,10 @@ func semawakeup(mp *m) {
 }
 
 func osinit() {
+	// Call miniterrno so that we can safely make system calls
+	// before calling minit on m0.
+	miniterrno()
+
 	ncpu = int32(sysconf(__SC_NPROCESSORS_ONLN))
 	physPageSize = sysconf(__SC_PAGE_SIZE)
 }