diff --git a/make/common/MakeIO.gmk b/make/common/MakeIO.gmk
index 7b4dd0a3c88..6075e034a19 100644
--- a/make/common/MakeIO.gmk
+++ b/make/common/MakeIO.gmk
@@ -257,7 +257,7 @@ ifeq ($(HAS_FILE_FUNCTION), true)
 else
   # Use printf to get consistent behavior on all platforms.
   WriteFile = \
-      $(shell $(PRINTF) "%s" $(call ShellQuote, $1) > $2)
+      $(shell $(PRINTF) "%s\n" $(strip $(call ShellQuote, $1)) > $2)
 endif
 
 # Param 1 - Text to write
@@ -268,5 +268,5 @@ ifeq ($(HAS_FILE_FUNCTION), true)
 else
   # Use printf to get consistent behavior on all platforms.
   AppendFile = \
-      $(shell $(PRINTF) "%s" $(call ShellQuote, $1) >> $2)
+      $(shell $(PRINTF) "%s\n" $(strip $(call ShellQuote, $1)) >> $2)
 endif
diff --git a/test/make/TestMakeBase.gmk b/test/make/TestMakeBase.gmk
index e7a1aad9d9f..c0662d396f9 100644
--- a/test/make/TestMakeBase.gmk
+++ b/test/make/TestMakeBase.gmk
@@ -171,6 +171,62 @@ ifneq ($(READ_WRITE_VALUE), $(READ_WRITE_RESULT))
   $(error Expected: >$(READ_WRITE_VALUE)< - Result: >$(READ_WRITE_RESULT)<)
 endif
 
+TEST_STRING_1 := 1234
+TEST_STRING_2 := 1234$(NEWLINE)
+TEST_STRING_3 := 1234$(NEWLINE)$(NEWLINE)
+
+# Writing a string ending in newline should not add a newline, but if it does
+# not, a newline should be added. We check this by verifying that the size of the
+# file is 5 characters for both test strings.
+TEST_FILE_1 := $(OUTPUT_DIR)/write-file-1
+TEST_FILE_2 := $(OUTPUT_DIR)/write-file-2
+TEST_FILE_3 := $(OUTPUT_DIR)/write-file-3
+
+$(call WriteFile, $(TEST_STRING_1), $(TEST_FILE_1))
+$(call WriteFile, $(TEST_STRING_2), $(TEST_FILE_2))
+$(call WriteFile, $(TEST_STRING_3), $(TEST_FILE_3))
+
+TEST_FILE_1_SIZE := $(strip $(shell $(WC) -c < $(TEST_FILE_1)))
+TEST_FILE_2_SIZE := $(strip $(shell $(WC) -c < $(TEST_FILE_2)))
+TEST_FILE_3_SIZE := $(strip $(shell $(WC) -c < $(TEST_FILE_3)))
+
+ifneq ($(TEST_FILE_1_SIZE), 5)
+  $(error Expected file size 5 for WriteFile 1, got $(TEST_FILE_1_SIZE))
+endif
+ifneq ($(TEST_FILE_2_SIZE), 5)
+  $(error Expected file size 5 for WriteFile 2, got $(TEST_FILE_2_SIZE))
+endif
+ifneq ($(TEST_FILE_3_SIZE), 5)
+  $(error Expected file size 5 for WriteFile 3, got $(TEST_FILE_3_SIZE))
+endif
+
+# Also test append (assumes WriteFile works as expected)
+$(call WriteFile, $(TEST_STRING_1), $(TEST_FILE_1))
+$(call AppendFile, $(TEST_STRING_1), $(TEST_FILE_1))
+$(call AppendFile, $(TEST_STRING_1), $(TEST_FILE_1))
+
+$(call WriteFile, $(TEST_STRING_2), $(TEST_FILE_2))
+$(call AppendFile, $(TEST_STRING_2), $(TEST_FILE_2))
+$(call AppendFile, $(TEST_STRING_2), $(TEST_FILE_2))
+
+$(call WriteFile, $(TEST_STRING_3), $(TEST_FILE_3))
+$(call AppendFile, $(TEST_STRING_3), $(TEST_FILE_3))
+$(call AppendFile, $(TEST_STRING_3), $(TEST_FILE_3))
+
+TEST_FILE_1_SIZE := $(strip $(shell $(WC) -c < $(TEST_FILE_1)))
+TEST_FILE_2_SIZE := $(strip $(shell $(WC) -c < $(TEST_FILE_2)))
+TEST_FILE_3_SIZE := $(strip $(shell $(WC) -c < $(TEST_FILE_3)))
+
+ifneq ($(TEST_FILE_1_SIZE), 15)
+  $(error Expected file size 15 for AppendFile 1, got $(TEST_FILE_1_SIZE))
+endif
+ifneq ($(TEST_FILE_2_SIZE), 15)
+  $(error Expected file size 15 for AppendFile 2, got $(TEST_FILE_2_SIZE))
+endif
+ifneq ($(TEST_FILE_3_SIZE), 15)
+  $(error Expected file size 15 for AppendFile 3, got $(TEST_FILE_3_SIZE))
+endif
+
 ################################################################################
 # Test creating dependencies on make variables