diff --git a/lld/ELF/Arch/PPC64.cpp b/lld/ELF/Arch/PPC64.cpp
--- a/lld/ELF/Arch/PPC64.cpp
+++ b/lld/ELF/Arch/PPC64.cpp
@@ -973,14 +973,14 @@
     uint32_t mask = 0x0000FFFC;
     checkInt(loc, val, 16, rel);
     checkAlignment(loc, val, 4, rel);
-    write32(loc, (read32(loc) & ~mask) | (val & mask));
+    write32(loc, read32(loc) | (val & mask));
     break;
   }
   case R_PPC64_REL24: {
     uint32_t mask = 0x03FFFFFC;
     checkInt(loc, val, 26, rel);
     checkAlignment(loc, val, 4, rel);
-    write32(loc, (read32(loc) & ~mask) | (val & mask));
+    write32(loc, read32(loc) | (val & mask));
     break;
   }
   case R_PPC64_DTPREL64: