diff --git a/src/generate_encryption_keys.c b/src/generate_encryption_keys.c
index 3fc43a7..d9f128b 100644
--- a/src/generate_encryption_keys.c
+++ b/src/generate_encryption_keys.c
@@ -1,5 +1,7 @@
 #include <stdbool.h>
 #include <stdio.h>
+#include <string.h>
+#include <ctype.h>
 #include <sodium.h>
 
 bool key_contains_zero(unsigned char *key, unsigned int keylen)
@@ -48,7 +50,14 @@ dump_key_as_exim_config(FILE * f, const char *name, unsigned char *key,
     sodium_bin2base64((char *const) b64string, b64len,
                       key, keylen,
                       sodium_base64_VARIANT_ORIGINAL);
-    fprintf(f, "%s = \"%s\"\n", name, b64string);
+    // generate uppercase version of variable name
+    size_t namelen = strlen(name);
+    char * nameupper = malloc(namelen);
+    for (unsigned int i = 0; i < namelen; i++) {
+        nameupper[i] = toupper((unsigned char) name[i]);
+    }
+
+    fprintf(f, "%s=%s\n", nameupper, b64string);
 
     free(b64string);
 }