diff --git a/arch/um/os-Linux/sys-i386/task_size.c b/arch/um/os-Linux/sys-i386/task_size.c
index 48d211b3d9a1d2a3455f61deab7de81fc05f0bdb..ccb49b0aff598d673659d12a8e7249feb485fdee 100644
--- a/arch/um/os-Linux/sys-i386/task_size.c
+++ b/arch/um/os-Linux/sys-i386/task_size.c
@@ -88,7 +88,10 @@ unsigned long os_get_task_size(void)
 	sa.sa_handler = segfault;
 	sigemptyset(&sa.sa_mask);
 	sa.sa_flags = SA_NODEFER;
-	sigaction(SIGSEGV, &sa, &old);
+	if (sigaction(SIGSEGV, &sa, &old)) {
+		perror("os_get_task_size");
+		exit(1);
+	}
 
 	if (!page_ok(bottom)) {
 		fprintf(stderr, "Address 0x%x no good?\n",
@@ -110,11 +113,12 @@ unsigned long os_get_task_size(void)
 
 out:
 	/* Restore the old SIGSEGV handling */
-	sigaction(SIGSEGV, &old, NULL);
-
+	if (sigaction(SIGSEGV, &old, NULL)) {
+		perror("os_get_task_size");
+		exit(1);
+	}
 	top <<= UM_KERN_PAGE_SHIFT;
 	printf("0x%x\n", top);
-	fflush(stdout);
 
 	return top;
 }