diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h
index c8114ee..cd8a48a 100644
--- a/src/journal/journal-file.h
+++ b/src/journal/journal-file.h
@@ -165,6 +165,9 @@ int journal_file_open_reliably(
  * files without adding too many zeros. */
 #define OFSfmt "%06"PRIx64
 
+/* The maximum number of fields in an entry */
+#define ENTRY_FIELD_COUNT_MAX 1024
+
 static inline bool VALID_REALTIME(uint64_t u) {
         /* This considers timestamps until the year 3112 valid. That should be plenty room... */
         return u > 0 && u < (1ULL << 55);
diff --git a/src/journal/journald-native.c b/src/journal/journald-native.c
index 5ff22a1..951d092 100644
--- a/src/journal/journald-native.c
+++ b/src/journal/journald-native.c
@@ -140,6 +140,11 @@ static int server_process_entry(
                 }
 
                 /* A property follows */
+                if (n > ENTRY_FIELD_COUNT_MAX) {
+                        log_debug("Received an entry that has more than " STRINGIFY(ENTRY_FIELD_COUNT_MAX) " fields, ignoring entry.");
+                        r = 1;
+                        goto finish;
+                }
 
                 /* n existing properties, 1 new, +1 for _TRANSPORT */
                 if (!GREEDY_REALLOC(iovec, m,