diff --git a/tools/fuzz/libelf/afl-libelf-fuzzer.c b/tools/fuzz/libelf/afl-libelf-fuzzer.c
index 02cbfb0e2c..115c98e22e 100644
--- a/tools/fuzz/libelf/afl-libelf-fuzzer.c
+++ b/tools/fuzz/libelf/afl-libelf-fuzzer.c
@@ -13,6 +13,8 @@ int main(int argc, char **argv)
     size_t size;
     FILE *fp;
 
+    setbuf(stdout, NULL);
+
     if ( argc != 2 )
     {
         printf("Expecting only one argument\n");
diff --git a/tools/fuzz/x86_instruction_emulator/afl-x86-insn-emulator-fuzzer.c b/tools/fuzz/x86_instruction_emulator/afl-x86-insn-emulator-fuzzer.c
index b5668c11e7..494c23ba2e 100644
--- a/tools/fuzz/x86_instruction_emulator/afl-x86-insn-emulator-fuzzer.c
+++ b/tools/fuzz/x86_instruction_emulator/afl-x86-insn-emulator-fuzzer.c
@@ -13,6 +13,8 @@ int main(int argc, char **argv)
     size_t size;
     FILE *fp;
 
+    setbuf(stdout, NULL);
+
     if ( argc != 2 )
     {
         printf("Expecting only one argument\n");