diff --git a/source/tools/acpixtract/acpixtract.c b/source/tools/acpixtract/acpixtract.c
index e5aedce59..7c47609bc 100644
--- a/source/tools/acpixtract/acpixtract.c
+++ b/source/tools/acpixtract/acpixtract.c
@@ -124,6 +124,10 @@
 
 /* Local prototypes */
 
+static void
+AxStrlwr (
+    char                    *String);
+
 static void
 AxCheckAscii (
     char                    *Name,
@@ -192,6 +196,31 @@ static char                 HeaderBuffer[AX_LINE_BUFFER_SIZE];
 static char                 InstanceBuffer[AX_LINE_BUFFER_SIZE];
 
 
+/*******************************************************************************
+ *
+ * FUNCTION:    AxStrlwr
+ *
+ * PARAMETERS:  String              - Ascii string
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: String lowercase function.
+ *
+ ******************************************************************************/
+
+static void
+AxStrlwr (
+    char                    *String)
+{
+
+    while (*String)
+    {
+        *String = (char) tolower ((int) *String);
+        String++;
+    }
+}
+
+
 /*******************************************************************************
  *
  * FUNCTION:    AxCheckAscii
@@ -599,6 +628,7 @@ AxExtractTables (
                 sprintf (Filename, "%4.4s.dat", ThisSignature);
             }
 
+            AxStrlwr (Filename);
             OutputFile = fopen (Filename, "w+b");
             if (!OutputFile)
             {