diff --git a/fuzzing/Extensions.cpp b/fuzzing/Extensions.cpp
index c8a0859..db30431 100644
--- a/fuzzing/Extensions.cpp
+++ b/fuzzing/Extensions.cpp
@@ -4,34 +4,57 @@
 
 #include <cstdio>
 #include <string>
+#include <cstdlib>
 
 /* We test the websocket extensions parser */
 #include "../src/WebSocketExtensions.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
+    /* This one must not return shared compressor, or above 13 */
     {
-        uWS::ExtensionsNegotiator<true> extensionsNegotiator(uWS::Options::PERMESSAGE_DEFLATE);
-        extensionsNegotiator.readOffer({(char *) data, size});
+        auto [negCompression, negCompressionWindow, negInflationWindow, response] = uWS::negotiateCompression(true, 13, 0, std::string_view((char *) data, size));
 
-        extensionsNegotiator.generateOffer();
-        extensionsNegotiator.getNegotiatedOptions();
+        if (negCompression) {
+            /* If we want dedicated compression, we must not end up here! */
+            if (negCompressionWindow == 0) {
+                free((void *) -1);
+            }
+
+            if (negCompressionWindow > 13) {
+                free((void *) -1);
+            }
+
+            if (negInflationWindow != 0) {
+                free((void *) -1);
+            }
+
+            if (negInflationWindow < 0 || negInflationWindow > 15 || negCompressionWindow < 0 || negCompressionWindow > 15) {
+                free((void *) -1);
+            }
+        }
     }
 
+    /* This one must not return anything over 0 (only shared) */
     {
-        uWS::ExtensionsNegotiator<true> extensionsNegotiator(uWS::Options::NO_OPTIONS);
-        extensionsNegotiator.readOffer({(char *) data, size});
+        auto [negCompression, negCompressionWindow, negInflationWindow, response] = uWS::negotiateCompression(true, 0, 0, std::string_view((char *) data, size));
 
-        extensionsNegotiator.generateOffer();
-        extensionsNegotiator.getNegotiatedOptions();
+        if (negCompression) {
+            /* If we want shared compression, we must not end up here! */
+            if (negCompressionWindow != 0) {
+                free((void *) -1);
+            }
+        }
     }
 
-    {
-        uWS::ExtensionsNegotiator<true> extensionsNegotiator(uWS::Options::CLIENT_NO_CONTEXT_TAKEOVER);
-        extensionsNegotiator.readOffer({(char *) data, size});
 
-        extensionsNegotiator.generateOffer();
-        extensionsNegotiator.getNegotiatedOptions();
+    /* Whatever, this one must not negotiate anything */
+    {
+        auto [negCompression, negCompressionWindow, negInflationWindow, response] = uWS::negotiateCompression(false, 13, 15, std::string_view((char *) data, size));
+
+        if (negCompression) {
+            free((void *) -1);
+        }
     }
 
     return 0;
diff --git a/fuzzing/Makefile b/fuzzing/Makefile
index 664ff93..38bd155 100644
--- a/fuzzing/Makefile
+++ b/fuzzing/Makefile
@@ -22,6 +22,7 @@ oss-fuzz:
 	# Link against object files
 	$(CXX) $(CXXFLAGS) $(WRAPPED_SYSCALLS) -std=c++17 -O2 -DUWS_NO_ZLIB -I../src -I../uSockets/src EpollHelloWorld.cpp -o $(OUT)/EpollHelloWorld $(LIB_FUZZING_ENGINE) *.o
 # "Unit tests"
+	$(CXX) $(CXXFLAGS) -std=c++17 -O3 Extensions.cpp -o $(OUT)/Extensions $(LIB_FUZZING_ENGINE)
 	$(CXX) $(CXXFLAGS) -std=c++17 -O3 QueryParser.cpp -o $(OUT)/QueryParser $(LIB_FUZZING_ENGINE)
 	$(CXX) $(CXXFLAGS) -std=c++17 -O3 WebSocket.cpp -o $(OUT)/WebSocket $(LIB_FUZZING_ENGINE)
 	$(CXX) $(CXXFLAGS) -std=c++17 -O3 Http.cpp -o $(OUT)/Http $(LIB_FUZZING_ENGINE)
@@ -37,5 +38,4 @@ oss-fuzz:
 
 broken:
 # Too small tests, failing coverage test
-	$(CXX) $(CXXFLAGS) -std=c++17 -O3 Extensions.cpp -o $(OUT)/Extensions $(LIB_FUZZING_ENGINE)
 	$(CXX) $(CXXFLAGS) -std=c++17 -O3 Handshake.cpp -o $(OUT)/Handshake $(LIB_FUZZING_ENGINE)