--- a/src/edge_utils.c
+++ b/src/edge_utils.c
@@ -19,6 +19,7 @@
 #include "n2n.h"
 #include "network_traffic_filter.h"
 #include "edge_utils_win32.h"
+#include <zstd.h>
 
 /* heap allocation for compression as per lzo example doc */
 #define HEAP_ALLOC(var,size) lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ]
--- a/tools/n2n-benchmark.c
+++ b/tools/n2n-benchmark.c
@@ -23,6 +23,7 @@
 #endif
 
 #include "n2n.h"
+#include <zstd.h>
 
 #define DURATION                2.5   // test duration per algorithm
 #define PACKETS_BEFORE_GETTIME  2047  // do not check time after every packet but after (2 ^ n - 1)
--- a/tools/tests-compress.c
+++ b/tools/tests-compress.c
@@ -22,6 +22,7 @@
 
 #include "n2n.h"
 #include "hexdump.h"
+#include <zstd.h>
 
 /* heap allocation for compression as per lzo example doc */
 #define HEAP_ALLOC(var,size) lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ]