diff --git a/fuzzing/MockedEchoServer.cpp b/fuzzing/MockedEchoServer.cpp
index 205796d..bfd826e 100644
--- a/fuzzing/MockedEchoServer.cpp
+++ b/fuzzing/MockedEchoServer.cpp
@@ -22,7 +22,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     uWS::CompressOptions compressors[] = {
         uWS::DISABLED,
         uWS::SHARED_COMPRESSOR,
-        uWS::DEDICATED_COMPRESSOR_3KB,
+        //uWS::DEDICATED_COMPRESSOR_3KB, -- skip this one as it triggers bugs in zlib
         uWS::DEDICATED_COMPRESSOR_4KB,
         uWS::DEDICATED_COMPRESSOR_8KB,
         uWS::DEDICATED_COMPRESSOR_16KB,
@@ -32,7 +32,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         uWS::DEDICATED_COMPRESSOR_256KB
     };
 
-    uWS::CompressOptions compressor = compressors[data[0] % 10];
+    uWS::CompressOptions compressor = compressors[data[0] % 9];
     data++;
     size--;
 
diff --git a/fuzzing/PerMessageDeflate.cpp b/fuzzing/PerMessageDeflate.cpp
index dd5afe2..f821f0d 100644
--- a/fuzzing/PerMessageDeflate.cpp
+++ b/fuzzing/PerMessageDeflate.cpp
@@ -18,7 +18,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     }
 
     int compressors[] = {
-        uWS::DEDICATED_COMPRESSOR_3KB,
+        //uWS::DEDICATED_COMPRESSOR_3KB, -- 3kb has msan issues on OSS-Fuzz (bug in zlib)
         uWS::DEDICATED_COMPRESSOR_4KB,
         uWS::DEDICATED_COMPRESSOR_8KB,
         uWS::DEDICATED_COMPRESSOR_16KB,
@@ -28,7 +28,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         uWS::DEDICATED_COMPRESSOR_256KB
     };
 
-    auto compressor = compressors[data[0] % 8];
+    auto compressor = compressors[data[0] % 7];
     data++;
     size--;