diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index 7c4df4655..089fd23a6 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -26,6 +26,8 @@ Added
   `unix-filename-rubout`.
 - New `fonts -> completion.category` setting to customize the font used for
   completion category headers.
+- New `:debug-log-capacity` command to adjust how many lines are logged into RAM
+  (to report bugs which are difficult to reproduce).
 
 Changed
 ~~~~~~~
diff --git a/README.asciidoc b/README.asciidoc
index 68a62714c..882301381 100644
--- a/README.asciidoc
+++ b/README.asciidoc
@@ -220,6 +220,7 @@ Contributors, sorted by the number of commits in descending order:
 * zwarag
 * xd1le
 * oniondreams
+* knaggita
 * issue
 * haxwithaxe
 * evan
diff --git a/doc/help/commands.asciidoc b/doc/help/commands.asciidoc
index eb384ffae..f43be5822 100644
--- a/doc/help/commands.asciidoc
+++ b/doc/help/commands.asciidoc
@@ -1400,6 +1400,7 @@ These commands are mainly intended for debugging. They are hidden if qutebrowser
 |<<debug-console,debug-console>>|Show the debugging console.
 |<<debug-crash,debug-crash>>|Crash for debugging purposes.
 |<<debug-dump-page,debug-dump-page>>|Dump the current page's content to a file.
+|<<debug-log-capacity,debug-log-capacity>>|Change the number of log lines to be stored in RAM.
 |<<debug-pyeval,debug-pyeval>>|Evaluate a python string and display the results as a web page.
 |<<debug-set-fake-clipboard,debug-set-fake-clipboard>>|Put data into the fake clipboard and enable logging, used for tests.
 |<<debug-trace,debug-trace>>|Trace executed code via hunter.
@@ -1442,6 +1443,15 @@ Dump the current page's content to a file.
 ==== optional arguments
 * +*-p*+, +*--plain*+: Write plain text instead of HTML.
 
+[[debug-log-capacity]]
+=== debug-log-capacity
+Syntax: +:debug-log-capacity 'capacity'+
+
+Change the number of log lines to be stored in RAM.
+
+==== positional arguments
+* +'capacity'+: Number of lines for the log.
+
 [[debug-pyeval]]
 === debug-pyeval
 Syntax: +:debug-pyeval [*--quiet*] 's'+
diff --git a/qutebrowser/misc/utilcmds.py b/qutebrowser/misc/utilcmds.py
index e1d7c6a61..fe9f580b7 100644
--- a/qutebrowser/misc/utilcmds.py
+++ b/qutebrowser/misc/utilcmds.py
@@ -234,3 +234,16 @@ def repeat_command(win_id, count=None):
     cmd = runners.last_command[mode_manager.mode]
     commandrunner = runners.CommandRunner(win_id)
     commandrunner.run(cmd[0], count if count is not None else cmd[1])
+
+
+@cmdutils.register(debug=True, name='debug-log-capacity')
+def log_capacity(capacity: int):
+    """Change the number of log lines to be stored in RAM.
+
+    Args:
+       capacity: Number of lines for the log.
+    """
+    if capacity < 0:
+        raise cmdexc.CommandError("Can't set a negative log capacity!")
+    else:
+        log.ram_handler.change_log_capacity(capacity)
diff --git a/qutebrowser/utils/log.py b/qutebrowser/utils/log.py
index a377ead57..177c263f8 100644
--- a/qutebrowser/utils/log.py
+++ b/qutebrowser/utils/log.py
@@ -511,6 +511,9 @@ class RAMHandler(logging.Handler):
                 lines.append(fmt(record))
         return '\n'.join(lines)
 
+    def change_log_capacity(self, capacity):
+        self._data = collections.deque(self._data, maxlen=capacity)
+
 
 class ColoredFormatter(logging.Formatter):
 
diff --git a/tests/end2end/features/misc.feature b/tests/end2end/features/misc.feature
index 1519e1867..686f5a8b4 100644
--- a/tests/end2end/features/misc.feature
+++ b/tests/end2end/features/misc.feature
@@ -442,6 +442,15 @@ Feature: Various utility commands.
         Then qute://log?level=error should be loaded
         And the page should contain the plaintext "No messages to show."
 
+    Scenario: Using :debug-log-capacity
+        When I run :debug-log-capacity 100
+        And I run :message-info oldstuff
+        And I run :repeat 10 :message-info otherstuff
+        And I run :message-info newstuff
+        And I open qute:log
+        Then the page should contain the plaintext "newstuff"
+        And the page should not contain the plaintext "oldstuff"
+
     ## https://github.com/The-Compiler/qutebrowser/issues/1523
 
     Scenario: Completing a single option argument