diff --git a/ChangeLog b/ChangeLog
index e2dbf357..84433de5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
-* 2022-06-: Version 1.7.1
+* 2022-08-12: Version 1.7.1
   * Always send the `dot` ALPN when using DoT
+  * Strengthen version determination for Libidn2 during cmake processing (thanks
+    jpbion).
 
 * 2021-06-04: Version 1.7.0
   * Make TLS Handshake timeout max 4/5th of timeout for the query,
diff --git a/cmake/modules/FindLibidn2.cmake b/cmake/modules/FindLibidn2.cmake
index 4ea374f5..0ddcbc28 100644
--- a/cmake/modules/FindLibidn2.cmake
+++ b/cmake/modules/FindLibidn2.cmake
@@ -52,9 +52,9 @@ if (LIBIDN2_INCLUDE_DIR AND LIBIDN2_LIBRARY)
       )
   endif ()
 
-  if (NOT LIBIDN2_VERSION AND LIBIDN2_INCLUDE_DIR AND EXISTS "${LIBIDN2_INCLUDE_DIR}/unbound.h")
-    file(STRINGS "${LIBIDN2_INCLUDE_DIR}/idn2.h" LIBIDN2_H REGEX "^#define IDN2_VERSION ")
-    string(REGEX REPLACE "^.*IDN2_VERSION \"([0-9.]+)\".*$" "\\1" LIBIDN2_VERSION "${LIBIDN2_H}")
+  if (NOT LIBIDN2_VERSION AND LIBIDN2_INCLUDE_DIR AND EXISTS "${LIBIDN2_INCLUDE_DIR}/idn2.h")
+    file(STRINGS "${LIBIDN2_INCLUDE_DIR}/idn2.h" LIBIDN2_H REGEX "^[ \t]*#[ \t]*define[ \t]+IDN2_VERSION[ \t]")
+    string(REGEX REPLACE "^.*IDN2_VERSION[ \t]+\"([0-9.]+)\".*$" "\\1" LIBIDN2_VERSION "${LIBIDN2_H}")
   endif ()
 endif()