diff --git a/make/compiler_flags b/make/compiler_flags
index a736830fc1a..61adb29ddab 100644
--- a/make/compiler_flags
+++ b/make/compiler_flags
@@ -1,6 +1,6 @@
 # Find files subroutine for different operating system
 # This is recursive version of the makefiles wildcard function
-findfiles = $(subst \n,,$(foreach d,$(wildcard $(addsuffix *,$(1))),$(call findfiles,$(d)/,$(2)) $(wildcard $(d)/$(2))))
+findfiles = $(strip $(subst \n,,$(foreach d,$(wildcard $(addsuffix *,$(1))),$(call findfiles,$(d)/,$(2)) $(wildcard $(d)/$(2)))))
 
 ifneq ($(OS),Windows_NT)
 GENERATE_DISTRIBUTION_TESTS=true