diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index c8afd69a1..d5159544c 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -1055,8 +1055,16 @@ class Coder:
         else:
             language = "the same language they are using"
 
+        if self.fence[0] == "`" * 4:
+            quad_backtick_reminder = (
+                "\nIMPORTANT: Use *quadruple* backticks ```` as fences, not triple backticks!\n"
+            )
+        else:
+            quad_backtick_reminder = ""
+
         prompt = prompt.format(
             fence=self.fence,
+            quad_backtick_reminder=quad_backtick_reminder,
             lazy_prompt=lazy_prompt,
             platform=platform_text,
             shell_cmd_prompt=shell_cmd_prompt,
diff --git a/aider/coders/editblock_prompts.py b/aider/coders/editblock_prompts.py
index 340b1abd5..d183b0ab5 100644
--- a/aider/coders/editblock_prompts.py
+++ b/aider/coders/editblock_prompts.py
@@ -157,7 +157,7 @@ Every *SEARCH/REPLACE block* must use this format:
 8. The closing fence: {fence[1]}
 
 Use the *FULL* file path, as shown to you by the user.
-
+{quad_backtick_reminder}
 Every *SEARCH* section must *EXACTLY MATCH* the existing file content, character for character, including all comments, docstrings, etc.
 If the file contains code or other data wrapped/escaped in json/xml/quotes or other containers, you need to propose edits to the literal contents of the file, including the container markup.