diff --git a/src/dump.c b/src/dump.c
index e0750c5..89802c6 100644
--- a/src/dump.c
+++ b/src/dump.c
@@ -101,7 +101,7 @@ static int dump_indent(size_t flags, int depth, int space, json_dump_callback_t
 static int dump_string(const char *str, size_t len, json_dump_callback_t dump, void *data, size_t flags)
 {
     const char *pos, *end, *lim;
-    int32_t codepoint;
+    int32_t codepoint = 0;
 
     if(dump("\"", 1, data))
         return -1;
diff --git a/src/hashtable_seed.c b/src/hashtable_seed.c
index 8aed540..540358a 100644
--- a/src/hashtable_seed.c
+++ b/src/hashtable_seed.c
@@ -164,7 +164,7 @@ static int seed_from_timestamp_and_pid(uint32_t *seed) {
 }
 
 static uint32_t generate_seed() {
-    uint32_t seed;
+    uint32_t seed = 0;
     int done = 0;
 
 #if !defined(_WIN32) && defined(USE_URANDOM)
diff --git a/src/value.c b/src/value.c
index 861dce8..3f964a0 100644
--- a/src/value.c
+++ b/src/value.c
@@ -1044,8 +1044,6 @@ json_t *json_copy(json_t *json)
         default:
             return NULL;
     }
-
-    return NULL;
 }
 
 json_t *json_deep_copy(const json_t *json)
@@ -1073,6 +1071,4 @@ json_t *json_deep_copy(const json_t *json)
         default:
             return NULL;
     }
-
-    return NULL;
 }