diff --git a/plugins/check_curl.c b/plugins/check_curl.c
index 9c0dc349..8f9a21d2 100644
--- a/plugins/check_curl.c
+++ b/plugins/check_curl.c
@@ -395,7 +395,7 @@ lookup_host (const char *host, char *buf, size_t buflen)
   char addrstr[100];
   size_t addrstr_len;
   int errcode;
-  void *ptr;
+  void *ptr = { 0 };
   size_t buflen_remaining = buflen - 1;
 
   memset (&hints, 0, sizeof (hints));
diff --git a/plugins/check_dbi.c b/plugins/check_dbi.c
index c24ca248..29c85206 100644
--- a/plugins/check_dbi.c
+++ b/plugins/check_dbi.c
@@ -141,7 +141,7 @@ main (int argc, char **argv)
 	if (verbose > 2)
 		printf ("Initializing DBI\n");
 
-	dbi_inst *instance_p;
+	dbi_inst *instance_p = { 0 };
 
 	if (dbi_initialize_r(NULL, instance_p) < 0) {
 		printf ("UNKNOWN - failed to initialize DBI; possibly you don't have any drivers installed.\n");
diff --git a/plugins/check_ntp_peer.c b/plugins/check_ntp_peer.c
index d4e5fd9a..4fb9018c 100644
--- a/plugins/check_ntp_peer.c
+++ b/plugins/check_ntp_peer.c
@@ -557,7 +557,8 @@ char *perfd_truechimers (int num_truechimers)
 }
 
 int main(int argc, char *argv[]){
-	int result, offset_result, stratum, num_truechimers, oresult, jresult, sresult, tresult;
+	int result, offset_result, stratum, num_truechimers;
+	int oresult, jresult, sresult, tresult = STATE_UNKNOWN;
 	double offset=0, jitter=0;
 	char *result_line, *perfdata_line;