diff --git a/Tests/CMakeOnly/CompilerIdC/CMakeLists.txt b/Tests/CMakeOnly/CompilerIdC/CMakeLists.txt
index 848ffdd36..6fea73eb8 100644
--- a/Tests/CMakeOnly/CompilerIdC/CMakeLists.txt
+++ b/Tests/CMakeOnly/CompilerIdC/CMakeLists.txt
@@ -12,3 +12,10 @@ foreach(v
     message(SEND_ERROR "${v} not set!")
   endif()
 endforeach()
+
+# Version numbers may only contain numbers and periods.
+if(NOT CMAKE_C_COMPILER_VERSION MATCHES
+    "^([0-9]+)(\\.([0-9]+))?(\\.([0-9]+))?(\\.([0-9]+))?$"
+    )
+  message(SEND_ERROR "Compiler version is not numeric!")
+endif()
diff --git a/Tests/CMakeOnly/CompilerIdCXX/CMakeLists.txt b/Tests/CMakeOnly/CompilerIdCXX/CMakeLists.txt
index 94ac31e4c..05e6bb222 100644
--- a/Tests/CMakeOnly/CompilerIdCXX/CMakeLists.txt
+++ b/Tests/CMakeOnly/CompilerIdCXX/CMakeLists.txt
@@ -12,3 +12,10 @@ foreach(v
     message(SEND_ERROR "${v} not set!")
   endif()
 endforeach()
+
+# Version numbers may only contain numbers and periods.
+if(NOT CMAKE_CXX_COMPILER_VERSION MATCHES
+    "^([0-9]+)(\\.([0-9]+))?(\\.([0-9]+))?(\\.([0-9]+))?$"
+    )
+  message(SEND_ERROR "Compiler version is not numeric!")
+endif()
diff --git a/Tests/CMakeOnly/CompilerIdFortran/CMakeLists.txt b/Tests/CMakeOnly/CompilerIdFortran/CMakeLists.txt
index 02e466887..067fb8cd3 100644
--- a/Tests/CMakeOnly/CompilerIdFortran/CMakeLists.txt
+++ b/Tests/CMakeOnly/CompilerIdFortran/CMakeLists.txt
@@ -12,3 +12,10 @@ foreach(v
     message(SEND_ERROR "${v} not set!")
   endif()
 endforeach()
+
+# Version numbers may only contain numbers and periods.
+if(NOT CMAKE_Fortran_COMPILER_VERSION MATCHES
+    "^([0-9]+)(\\.([0-9]+))?(\\.([0-9]+))?(\\.([0-9]+))?$"
+    )
+  message(SEND_ERROR "Compiler version is not numeric!")
+endif()