diff --git a/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/signal/6-1.c b/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/signal/6-1.c
index ea9e0a9fd4..d032e2be3f 100644
--- a/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/signal/6-1.c
+++ b/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/signal/6-1.c
@@ -24,15 +24,15 @@ void myhandler(int signo)
 
 int main()
 {
-	errno = -1;
+	errno = 0;
 
 	if (signal(-1, myhandler) != SIG_ERR) {
                 printf("Test FAILED: signal() didn't return SIG_ERR even though invalid signal number was passed to it\n");
                	return PTS_FAIL;
         }
 
-	if (errno <= 0) {
-		printf("Test FAILED: errno wasn't set to a positive number even though invalid signal number was passed to the signal() function\n");
+	if (errno != EINVAL) {
+		printf("Test FAILED: errno wasn't set to EINVAL even though invalid signal number was passed to the signal() function\n");
                	return PTS_FAIL;
         }
     printf("signal(): Test passed\n");
diff --git a/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/signal/7-1.c b/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/signal/7-1.c
index d4a59427d7..e213dacb32 100644
--- a/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/signal/7-1.c
+++ b/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/signal/7-1.c
@@ -24,15 +24,15 @@ void myhandler(int signo)
 
 int main()
 {
-	errno = -1;
+	errno = 0;
 
 	if (signal(SIGKILL, myhandler) != SIG_ERR) {
                 printf("Test FAILED: signal() didn't return SIG_ERR even though a non-catchable signal was passed to it\n");
                	return PTS_FAIL;
         }
 
-	if (errno <= 0) {
-		printf("Test FAILED: errno wasn't set to a positive number even though a non-catchable signal was passed to the signal() function\n");
+	if (errno != EINVAL) {
+		printf("Test FAILED: errno wasn't set to EINVAL even though a non-catchable signal was passed to the signal() function\n");
                	return PTS_FAIL;
         }
     printf("signal(): Test passed\n");