diff --git a/tools/git2.py b/tools/git2.py
index 80d80b9..92f1a98 100644
--- a/tools/git2.py
+++ b/tools/git2.py
@@ -27,6 +27,8 @@ def build_library(env, deps):
         "LIBSSH2_LIBRARY": deps[-1],
         "USE_WINHTTP": 0,
         "STATIC_CRT": env.get("use_static_cpp", True),
+        "CMAKE_DISABLE_FIND_PACKAGE_ZLIB": 1,
+        "CMAKE_DISABLE_FIND_PACKAGE_OPENSSL": 1,
     }
 
     if env["platform"] != "windows":
diff --git a/tools/ssh2.py b/tools/ssh2.py
index a5cbe60..581ad46 100644
--- a/tools/ssh2.py
+++ b/tools/ssh2.py
@@ -12,6 +12,8 @@ def build_library(env, deps):
         "BUILD_EXAMPLES": 0,
         "BUILD_TESTING": 0,
         "BUILD_SHARED_LIBS": 0,
+        "CMAKE_DISABLE_FIND_PACKAGE_ZLIB": 1,
+        "CMAKE_DISABLE_FIND_PACKAGE_OPENSSL": 1,
         "CRYPTO_BACKEND": "OpenSSL",
     }