diff --git a/ChangeLog b/ChangeLog
index 7bcb12e4..04c2b942 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+* 2022-07-20
+  * Strengthen version determination for Libidn2 during cmake processing.
+
 * 2021-06-04: Version 1.7.0
   * Make TLS Handshake timeout max 4/5th of timeout for the query,
     just like connection setup timeout was, so fallback transport
diff --git a/cmake/modules/FindLibidn2.cmake b/cmake/modules/FindLibidn2.cmake
index 4ea374f5..c56d5b61 100644
--- a/cmake/modules/FindLibidn2.cmake
+++ b/cmake/modules/FindLibidn2.cmake
@@ -53,8 +53,8 @@ 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}")
+    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()