diff --git a/fuzzers/frida_libpng/harness.cc b/fuzzers/frida_libpng/harness.cc
index 20a2070e16..b5e3e6eda8 100644
--- a/fuzzers/frida_libpng/harness.cc
+++ b/fuzzers/frida_libpng/harness.cc
@@ -88,7 +88,7 @@ static char * allocation = NULL;
 __attribute__((noinline))
 void func3( char * alloc) {
   printf("func3\n");
-  if (random() % 5 == 0) {
+  if (random() == 0) {
     alloc[0xff] = 0xde;
   }
 }