diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index a982d2cd28..ca82d8af35 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -756,15 +756,16 @@ function(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
     # With the IAR Compiler, some strings are found twice, first time as incomplete
     # list like "?<Constant "INFO:compiler[IAR]">".  Remove the incomplete copies.
     list(FILTER CMAKE_${lang}_COMPILER_ID_STRINGS EXCLUDE REGEX "\\?<Constant \\\"")
+    # The IAR-AVR compiler uses a binary format that places a '6'
+    # character (0x34) before each character in the string.  Strip
+    # out these characters without removing any legitimate characters.
+    if(CMAKE_${lang}_COMPILER_ID_STRINGS MATCHES "(.)I.N.F.O.:.")
+      string(REGEX REPLACE "${CMAKE_MATCH_1}([^;])" "\\1"
+        CMAKE_${lang}_COMPILER_ID_STRINGS "${CMAKE_${lang}_COMPILER_ID_STRINGS}")
+    endif()
     # In C# binaries, some strings are found more than once.
     list(REMOVE_DUPLICATES CMAKE_${lang}_COMPILER_ID_STRINGS)
     foreach(info ${CMAKE_${lang}_COMPILER_ID_STRINGS})
-      # The IAR-AVR compiler uses a binary format that places a '6'
-      # character (0x34) before each character in the string.  Strip
-      # out these characters without removing any legitimate characters.
-      if("${info}" MATCHES "(.)I.N.F.O.:.")
-        string(REGEX REPLACE "${CMAKE_MATCH_1}(.)" "\\1" info "${info}")
-      endif()
       if("${info}" MATCHES "INFO:compiler\\[([^]\"]*)\\]")
         if(COMPILER_ID)
           set(COMPILER_ID_TWICE 1)