diff --git a/Libraries/LibWeb/Layout/FlexFormattingContext.cpp b/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
index 28a72296edd..4ba0cec3bb5 100644
--- a/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
+++ b/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
@@ -825,7 +825,7 @@ void FlexFormattingContext::collect_flex_items_into_flex_lines()
     CSSPixels line_main_size = 0;
     for (auto& item : m_flex_items) {
         auto const outer_hypothetical_main_size = item.outer_hypothetical_main_size();
-        if (!line.items.is_empty() && (line_main_size + outer_hypothetical_main_size) > m_available_space_for_items->main) {
+        if (!line.items.is_empty() && (line_main_size + outer_hypothetical_main_size) > m_available_space_for_items->main.to_px_or_zero()) {
             m_flex_lines.append(move(line));
             line = {};
             line_main_size = 0;
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-flexbox/align-content-vert-001b.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-flexbox/align-content-vert-001b.txt
index b7cd6768979..c702687e673 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/css-flexbox/align-content-vert-001b.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-flexbox/align-content-vert-001b.txt
@@ -2,77 +2,77 @@ Harness status: OK
 
 Found 72 tests
 
-17 Pass
-55 Fail
+70 Pass
+2 Fail
 Pass	.flexbox div 1
 Pass	.flexbox div 2
-Fail	.flexbox div 3
-Fail	.flexbox div 4
+Pass	.flexbox div 3
+Pass	.flexbox div 4
 Pass	.flexbox div 5
-Fail	.flexbox div 6
-Fail	.flexbox div 7
-Fail	.flexbox div 8
+Pass	.flexbox div 6
+Pass	.flexbox div 7
+Pass	.flexbox div 8
 Pass	.flexbox div 9
 Pass	.flexbox div 10
-Fail	.flexbox div 11
-Fail	.flexbox div 12
+Pass	.flexbox div 11
+Pass	.flexbox div 12
 Pass	.flexbox div 13
-Fail	.flexbox div 14
-Fail	.flexbox div 15
-Fail	.flexbox div 16
+Pass	.flexbox div 14
+Pass	.flexbox div 15
+Pass	.flexbox div 16
 Pass	.flexbox div 17
-Fail	.flexbox div 18
-Fail	.flexbox div 19
-Fail	.flexbox div 20
-Fail	.flexbox div 21
-Fail	.flexbox div 22
-Fail	.flexbox div 23
-Fail	.flexbox div 24
+Pass	.flexbox div 18
+Pass	.flexbox div 19
+Pass	.flexbox div 20
+Pass	.flexbox div 21
+Pass	.flexbox div 22
+Pass	.flexbox div 23
+Pass	.flexbox div 24
 Pass	.flexbox div 25
-Fail	.flexbox div 26
-Fail	.flexbox div 27
-Fail	.flexbox div 28
-Fail	.flexbox div 29
-Fail	.flexbox div 30
-Fail	.flexbox div 31
-Fail	.flexbox div 32
+Pass	.flexbox div 26
+Pass	.flexbox div 27
+Pass	.flexbox div 28
+Pass	.flexbox div 29
+Pass	.flexbox div 30
+Pass	.flexbox div 31
+Pass	.flexbox div 32
 Pass	.flexbox div 33
 Pass	.flexbox div 34
-Fail	.flexbox div 35
-Fail	.flexbox div 36
+Pass	.flexbox div 35
+Pass	.flexbox div 36
 Pass	.flexbox div 37
-Fail	.flexbox div 38
-Fail	.flexbox div 39
-Fail	.flexbox div 40
+Pass	.flexbox div 38
+Pass	.flexbox div 39
+Pass	.flexbox div 40
 Pass	.flexbox div 41
-Fail	.flexbox div 42
-Fail	.flexbox div 43
-Fail	.flexbox div 44
-Fail	.flexbox div 45
-Fail	.flexbox div 46
-Fail	.flexbox div 47
-Fail	.flexbox div 48
+Pass	.flexbox div 42
+Pass	.flexbox div 43
+Pass	.flexbox div 44
+Pass	.flexbox div 45
+Pass	.flexbox div 46
+Pass	.flexbox div 47
+Pass	.flexbox div 48
 Pass	.flexbox div 49
-Fail	.flexbox div 50
+Pass	.flexbox div 50
 Fail	.flexbox div 51
 Fail	.flexbox div 52
-Fail	.flexbox div 53
-Fail	.flexbox div 54
-Fail	.flexbox div 55
-Fail	.flexbox div 56
+Pass	.flexbox div 53
+Pass	.flexbox div 54
+Pass	.flexbox div 55
+Pass	.flexbox div 56
 Pass	.flexbox div 57
 Pass	.flexbox div 58
-Fail	.flexbox div 59
-Fail	.flexbox div 60
+Pass	.flexbox div 59
+Pass	.flexbox div 60
 Pass	.flexbox div 61
-Fail	.flexbox div 62
-Fail	.flexbox div 63
-Fail	.flexbox div 64
+Pass	.flexbox div 62
+Pass	.flexbox div 63
+Pass	.flexbox div 64
 Pass	.flexbox div 65
-Fail	.flexbox div 66
-Fail	.flexbox div 67
-Fail	.flexbox div 68
-Fail	.flexbox div 69
-Fail	.flexbox div 70
-Fail	.flexbox div 71
-Fail	.flexbox div 72
\ No newline at end of file
+Pass	.flexbox div 66
+Pass	.flexbox div 67
+Pass	.flexbox div 68
+Pass	.flexbox div 69
+Pass	.flexbox div 70
+Pass	.flexbox div 71
+Pass	.flexbox div 72
\ No newline at end of file