diff --git a/src/lib/base64.h b/src/lib/base64.h
index c6c0cda2e..b4ccd1c8b 100644
--- a/src/lib/base64.h
+++ b/src/lib/base64.h
@@ -5,6 +5,22 @@
 extern "C" {
 #endif
 
+// convert a base64 character into its equivalent integer 0..63
+static inline int
+b64idx(char b64){
+  if(b64 >= 'A' && b64 <= 'Z'){
+    return b64 - 'A';
+  }else if(b64 >= 'a' && b64 <= 'z'){
+    return b64 - 'a' + 26;
+  }else if(b64 >= '0' && b64 <= '9'){
+    return b64 - '0' + 52;
+  }else if(b64 == '+'){
+    return 62;
+  }else{
+    return 63;
+  }
+}
+
 // lookup table for base64
 static unsigned const char b64subs[] =
  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
diff --git a/src/lib/kitty.c b/src/lib/kitty.c
index 17568ef35..af99d7a1b 100644
--- a/src/lib/kitty.c
+++ b/src/lib/kitty.c
@@ -47,22 +47,6 @@
 //
 // https://sw.kovidgoyal.net/kitty/graphics-protocol.html
 
-// convert a base64 character into its equivalent integer 0..63
-static inline int
-b64idx(char b64){
-  if(b64 >= 'A' && b64 <= 'Z'){
-    return b64 - 'A';
-  }else if(b64 >= 'a' && b64 <= 'z'){
-    return b64 - 'a' + 26;
-  }else if(b64 >= '0' && b64 <= '9'){
-    return b64 - '0' + 52;
-  }else if(b64 == '+'){
-    return 62;
-  }else{
-    return 63;
-  }
-}
-
 // null out part of a triplet (a triplet is 3 pixels, which map to 12 bytes, which map to
 // 16 bytes when base64 encoded). skip the initial |skip| pixels, and null out a maximum
 // of |max| pixels after that. returns the number of pixels nulled out. |max| must be