5 files changed, 8 insertions, 6 deletions
diff --git a/testsuites/libtests/POSIX/free.c b/testsuites/libtests/POSIX/free.c
index 8550eaa85c..246415ce65 100644
--- a/testsuites/libtests/POSIX/free.c
+++ b/testsuites/libtests/POSIX/free.c
@@ -12,9 +12,10 @@
 
 #include <stdlib.h>
 
+void* p;
+
 int main (void)
 {
-  free((void *) 42);
-
+  free(p);
   return 0;
 }
diff --git a/testsuites/libtests/POSIX/readv.c b/testsuites/libtests/POSIX/readv.c
index a980e9468c..6b0bf63f94 100644
--- a/testsuites/libtests/POSIX/readv.c
+++ b/testsuites/libtests/POSIX/readv.c
@@ -14,7 +14,7 @@
 
 int main(void)
 {
-  struct iovec iov;
+  struct iovec iov = { 0 };
   int count = 4;
   ssize_t ret;
 
diff --git a/testsuites/libtests/POSIX/sigismember.c b/testsuites/libtests/POSIX/sigismember.c
index ed980b70f0..f4c7d37cb2 100644
--- a/testsuites/libtests/POSIX/sigismember.c
+++ b/testsuites/libtests/POSIX/sigismember.c
@@ -14,7 +14,7 @@
 
 int main(void)
 {
-  sigset_t set;
+  sigset_t set = { 0 };
   int status;
   status = sigismember(&set, 21);
 
diff --git a/testsuites/libtests/POSIX/sigprocmask.c b/testsuites/libtests/POSIX/sigprocmask.c
index ba634e4660..25de0c28c7 100644
--- a/testsuites/libtests/POSIX/sigprocmask.c
+++ b/testsuites/libtests/POSIX/sigprocmask.c
@@ -15,7 +15,8 @@
 int main(void)
 {
   int rc;
-  sigset_t set1, set2;
+  sigset_t set1 = { 0 };
+  sigset_t set2 = { 0 };
 
   rc = sigprocmask(SIG_BLOCK, &set1, &set2);
   (void) rc;
diff --git a/testsuites/libtests/POSIX/writev.c b/testsuites/libtests/POSIX/writev.c
index 853b8a8ced..5b5068db65 100644
--- a/testsuites/libtests/POSIX/writev.c
+++ b/testsuites/libtests/POSIX/writev.c
@@ -14,7 +14,7 @@
 
 int main(void)
 {
-  struct iovec iov;
+  struct iovec iov = { 0 };
   int count = 4;
   ssize_t ret;