diff --git a/CMakeLists.txt b/CMakeLists.txt
index 853554f9a8..16099a541c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -856,7 +856,6 @@ if(USE_NGTCP2)
   else()
     message(FATAL_ERROR "ngtcp2 requires OpenSSL, wolfSSL or GnuTLS")
   endif()
-  set(USE_NGTCP2 ON)
   include_directories(${NGTCP2_INCLUDE_DIRS})
   list(APPEND CURL_LIBS ${NGTCP2_LIBRARIES})
   list(APPEND LIBCURL_PC_REQUIRES_PRIVATE "libngtcp2")
@@ -878,7 +877,6 @@ if(USE_QUICHE)
     message(FATAL_ERROR "quiche requires BoringSSL")
   endif()
   openssl_check_quic()
-  set(USE_QUICHE ON)
   include_directories(${QUICHE_INCLUDE_DIRS})
   list(APPEND CURL_LIBS ${QUICHE_LIBRARIES})
   list(APPEND LIBCURL_PC_REQUIRES_PRIVATE "quiche")
@@ -897,7 +895,6 @@ if(USE_MSH3)
     message(FATAL_ERROR "Only one HTTP/3 backend can be selected!")
   endif()
   find_package(MSH3 REQUIRED)
-  set(USE_MSH3 ON)
   include_directories(${MSH3_INCLUDE_DIRS})
   list(APPEND CURL_LIBS ${MSH3_LIBRARIES})
   list(APPEND LIBCURL_PC_REQUIRES_PRIVATE "libmsh3")