diff --git a/src/journal/journald-native.c b/src/journal/journald-native.c
index e86178ed77..d0fee2a797 100644
--- a/src/journal/journald-native.c
+++ b/src/journal/journald-native.c
@@ -141,6 +141,11 @@ 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,
diff --git a/src/shared/journal-importer.h b/src/shared/journal-importer.h
index 53354b7c78..7914c0cf5f 100644
--- a/src/shared/journal-importer.h
+++ b/src/shared/journal-importer.h
@@ -21,6 +21,9 @@
 #endif
 #define LINE_CHUNK 8*1024u
 
+/* The maximum number of fields in an entry */
+#define ENTRY_FIELD_COUNT_MAX 1024
+
 struct iovec_wrapper {
         struct iovec *iovec;
         size_t size_bytes;