diff --git a/include/curl/curlbuild.h.cmake b/include/curl/curlbuild.h.cmake
index 0de6040c0aec9a..41cb834e8e3182 100644
--- a/include/curl/curlbuild.h.cmake
+++ b/include/curl/curlbuild.h.cmake
@@ -148,7 +148,9 @@
 #  include <sys/poll.h>
 #endif
 
-#include <intsizeof.h> // INSIZEOF_LONG
+#include <intsizeof.h> // INTSIZEOF_LONG
+
+#define CURL_SIZEOF_LONG INTSIZEOF_LONG
 
 /* Integral data type used for curl_socklen_t. */
 #define CURL_TYPEOF_CURL_SOCKLEN_T ${CURL_TYPEOF_CURL_SOCKLEN_T}
@@ -159,7 +161,7 @@ typedef CURL_TYPEOF_CURL_SOCKLEN_T curl_socklen_t;
 #define HAVE_SIZEOF_SSIZE_T ${HAVE_SIZEOF_SSIZE_T}
 
 /* unsigned curl_off_t constant suffix. */
-#if INSIZEOF_LONG == 8
+#if INTSIZEOF_LONG == 8
 # define CURL_SIZEOF_CURL_OFF_T 8
 # define CURL_TYPEOF_CURL_OFF_T long
 # define CURL_FORMAT_CURL_OFF_T "ld"
diff --git a/lib/curl_config.h.cmake b/lib/curl_config.h.cmake
index 051ed3eaaf167a..79d3721c6da232 100644
--- a/lib/curl_config.h.cmake
+++ b/lib/curl_config.h.cmake
@@ -878,9 +878,6 @@
 /* The size of `short', as computed by sizeof. */
 #define SIZEOF_SHORT INTSIZEOF_SHRT
 
-/* The size of `long', as computed by sizeof. */
-#define CURL_SIZEOF_LONG INTSIZEOF_LONG
-
 /* The size of `size_t', as computed by sizeof. */
 #define SIZEOF_SIZE_T INTSIZEOF_SIZE