diff --git a/core/ext/image.ext.php b/core/ext/image.ext.php
index d1e62cbe..dc986eaf 100644
--- a/core/ext/image.ext.php
+++ b/core/ext/image.ext.php
@@ -101,7 +101,8 @@ class ImageIO extends Extension {
 		$q = $config->get_int("thumb_quality");
 		$mem = $config->get_int("thumb_max_memory") / 1024 / 1024; // IM takes memory in MB
 
-		exec("convert {$inname}[0] -limit memory {$mem} -geometry {$w}x{$h} -quality {$q} jpg:$outname");
+		// "-limit memory $mem" broken?
+		exec("convert {$inname}[0] -geometry {$w}x{$h} -quality {$q} jpg:$outname");
 
 		return true;
 	}
diff --git a/ext/regen_thumb/main.php b/ext/regen_thumb/main.php
index adb17e9c..0c27556f 100644
--- a/ext/regen_thumb/main.php
+++ b/ext/regen_thumb/main.php
@@ -42,7 +42,8 @@ class RegenThumb extends Extension {
 			case 'convert':
 				if(file_exists($f_thumb)) unlink($f_thumb);
 				$mem = $config->get_int("thumb_max_memory") / 1024 / 1024; // IM takes memory in MB
-				exec("convert {$f_image}[0] -limit memory {$mem} -geometry {$w}x{$h} -quality {$q} jpg:$f_thumb");
+				// "-limit memory $mem" broken?
+				exec("convert {$f_image}[0] -geometry {$w}x{$h} -quality {$q} jpg:$f_thumb");
 				break;
 			case 'gd':
 				$this->make_thumb_gd($f_image, $f_thumb);