diff --git a/lld/MachO/Writer.cpp b/lld/MachO/Writer.cpp
--- a/lld/MachO/Writer.cpp
+++ b/lld/MachO/Writer.cpp
@@ -134,7 +134,10 @@
     c->nsects = seg->numNonHiddenSections();
 
     for (OutputSection *osec : seg->getSections()) {
-      c->filesize += osec->getFileSize();
+      // This condition should hold unless we are dealing with a __bss section.
+      if (osec->fileOff >= seg->fileOff)
+        c->filesize = std::max(
+            c->filesize, osec->fileOff + osec->getFileSize() - seg->fileOff);
 
       if (osec->isHidden())
         continue;
@@ -451,6 +454,8 @@
   seg->fileOff = fileOff;
 
   for (auto *osec : seg->getSections()) {
+    if (!osec->isNeeded())
+      continue;
     addr = alignTo(addr, osec->align);
     fileOff = alignTo(fileOff, osec->align);
     osec->addr = addr;
diff --git a/lld/test/MachO/section-headers.s b/lld/test/MachO/section-headers.s
--- a/lld/test/MachO/section-headers.s
+++ b/lld/test/MachO/section-headers.s
@@ -1,7 +1,7 @@
 # REQUIRES: x86
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t.o
 # RUN: lld -flavor darwinnew -o %t %t.o
-# RUN: llvm-readobj --section-headers %t | FileCheck %s
+# RUN: llvm-readobj --section-headers --macho-segment %t | FileCheck %s
 
 # CHECK:      Name: __text
 # CHECK-NEXT: Segment: __TEXT
@@ -25,11 +25,21 @@
 
 # CHECK:      Name: maxlen_16ch_name
 # CHECK-NEXT: Segment: __TEXT
-# CHECK-NOT:  }
-# CHECK:      Alignment: 3
+# CHECK-NEXT: Address:
+# CHECK-NEXT: Size: [[#%x, LAST_SEC_SIZE:]]
+# CHECK-NEXT: Offset: [[#%u, LAST_SEC_OFF:]]
+# CHECK-NEXT: Alignment: 3
 # CHECK-NOT:  }
 # CHECK:      Type: Regular (0x0)
 
+# CHECK-LABEL: Segment {
+# CHECK:       Name: __TEXT
+# CHECK-NEXT:  Size:
+# CHECK-NEXT:  vmaddr:
+# CHECK-NEXT:  vmsize:
+# CHECK-NEXT:  fileoff: 0
+# CHECK-NEXT:  filesize: [[#%u, LAST_SEC_SIZE + LAST_SEC_OFF]]
+
 .text
 .align 1
 .global _main