diff --git a/tinycap.c b/tinycap.c
index c838348..e470488 100644
--- a/tinycap.c
+++ b/tinycap.c
@@ -185,7 +185,7 @@
                             enum pcm_format format, unsigned int period_size,
                             unsigned int period_count)
 {
-    struct pcm_config config;
+    struct pcm_config config = {0};
     struct pcm *pcm;
     char *buffer;
     unsigned int size;
diff --git a/tinyplay.c b/tinyplay.c
index 88c54ae..7422554 100644
--- a/tinyplay.c
+++ b/tinyplay.c
@@ -212,7 +212,7 @@
                  unsigned int rate, unsigned int bits, unsigned int period_size,
                  unsigned int period_count)
 {
-    struct pcm_config config;
+    struct pcm_config config = {0};
     struct pcm *pcm;
     char *buffer;
     int size;