diff --git a/CMakeLists.txt b/CMakeLists.txt
index 70812b5c6a..d8243119b4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1676,6 +1676,7 @@ check_include_file("poll.h"           HAVE_POLL_H)
 check_include_file("pwd.h"            HAVE_PWD_H)
 check_include_file("stdatomic.h"      HAVE_STDATOMIC_H)
 check_include_file("stdbool.h"        HAVE_STDBOOL_H)
+check_include_file("stdint.h"         HAVE_STDINT_H)
 check_include_file("strings.h"        HAVE_STRINGS_H)
 check_include_file("stropts.h"        HAVE_STROPTS_H)
 check_include_file("termio.h"         HAVE_TERMIO_H)
diff --git a/configure.ac b/configure.ac
index a4e09e6655..a5c3f07940 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3902,6 +3902,7 @@ AC_CHECK_HEADERS(
   libgen.h \
   locale.h \
   stdbool.h \
+  stdint.h \
   sys/filio.h \
   sys/eventfd.h,
 dnl to do if not found
diff --git a/lib/curl_config.h.cmake b/lib/curl_config.h.cmake
index fd82e41ca5..e78747e668 100644
--- a/lib/curl_config.h.cmake
+++ b/lib/curl_config.h.cmake
@@ -469,6 +469,9 @@
 /* Define to 1 if you have the sendmmsg function. */
 #cmakedefine HAVE_SENDMMSG 1
 
+/* Define to 1 if you have the <stdint.h> header file. */
+#cmakedefine HAVE_STDINT_H 1
+
 /* Define to 1 if you have the 'fsetxattr' function. */
 #cmakedefine HAVE_FSETXATTR 1