diff --git a/html/inc/prefs.inc b/html/inc/prefs.inc
index 7f22913383..2fedbaff46 100644
--- a/html/inc/prefs.inc
+++ b/html/inc/prefs.inc
@@ -45,12 +45,14 @@ $cpu_prefs = array(
     tra("Usage limits"),
     new PREF_NUM(
         tra("Use at most"),
+        // xgettext:no-php-format
         tra("Keep some CPUs free for other applications. Example: 75% means use 6 cores on an 8-core CPU."),
         "max_ncpus_pct",
         new NUM_SPEC(tra("% of the CPUs"), 1, 100, 100)
     ),
     new PREF_NUM(
         tra("Use at most"),
+        // xgettext:no-php-format
         tra("Suspend/resume computing every few seconds to reduce CPU temperature and energy usage. Example: 75% means compute for 3 seconds, wait for 1 second, and repeat."),
         "cpu_usage_limit",
         new NUM_SPEC(tra("% of CPU time"), 1, 100, 100)
@@ -144,6 +146,7 @@ $disk_prefs = array(
         tra("Use no more than"),
         tra("Limit the percentage of disk space used by BOINC on the volume where it stores data."),
         "disk_max_used_pct",
+        // xgettext:no-php-format
         new NUM_SPEC(tra("% of total"), 0, 100, $dp->disk_max_used_pct)
     ),
 );
@@ -153,12 +156,14 @@ $mem_prefs = array(
         tra("When computer is in use, use at most"),
         tra("Limit the memory used by BOINC when you're using the computer."),
         "ram_max_used_busy_pct",
+        // xgettext:no-php-format
         new NUM_SPEC(tra("%"), 1, 100, 50)
     ),
     new PREF_NUM(
         tra("When computer is not in use, use at most"),
         tra("Limit the memory used by BOINC when you're not using the computer."),
         "ram_max_used_idle_pct",
+        // xgettext:no-php-format
         new NUM_SPEC(tra("%"), 1, 100, 90)
     ),
     new PREF_BOOL(
@@ -171,6 +176,7 @@ $mem_prefs = array(
         tra("Page/swap file: use at most"),
         tra("Limit the swap space (page file) used by BOINC."),
         "vm_max_used_pct",
+        // xgettext:no-php-format
         new NUM_SPEC(tra("%"), 1, 100, 75)
     ),
 );
diff --git a/html/project.sample/project_specific_prefs.inc b/html/project.sample/project_specific_prefs.inc
index ab086bed8c..59b806d1ad 100644
--- a/html/project.sample/project_specific_prefs.inc
+++ b/html/project.sample/project_specific_prefs.inc
@@ -51,6 +51,7 @@ function option($name, $val) {
 }
 
 define('COLOR_DESC', tra('Color scheme for graphics'));
+// xgettext:no-php-format
 define("MAX_GFX_CPU_PCT_DESC", tra("Maximum CPU % for graphics%10 ... 100%2", "<br><p class=\"text-muted\">", "</p>"));
 define('APP_SELECT_DESC', tra('Run only the selected applications'));
 define('APP_SELECT_TOOLTIP', tra('Only get tasks for certain applications. Useful to focus on particular applications, or to exclude them.'));