diff --git a/src/libutil/file-descriptor.cc b/src/libutil/file-descriptor.cc
index fd2912ae1..9e23ad422 100644
--- a/src/libutil/file-descriptor.cc
+++ b/src/libutil/file-descriptor.cc
@@ -97,7 +97,7 @@ void writeFull(Descriptor fd, std::string_view s, bool allowInterrupts)
         if (allowInterrupts)
             checkInterrupt();
         auto res = retryOnBlock(fd, PollDirection::Out, [&]() {
-            return write(fd, {reinterpret_cast<const std::byte *>(s.data()), s.size()});
+            return write(fd, {reinterpret_cast<const std::byte *>(s.data()), s.size()}, allowInterrupts);
         });
         if (res > 0)
             s.remove_prefix(res);
diff --git a/src/libutil/include/nix/util/file-descriptor.hh b/src/libutil/include/nix/util/file-descriptor.hh
index 72683de54..1e0d726ad 100644
--- a/src/libutil/include/nix/util/file-descriptor.hh
+++ b/src/libutil/include/nix/util/file-descriptor.hh
@@ -85,7 +85,7 @@ size_t read(Descriptor fd, std::span<std::byte> buffer);
  * @return The number of bytes actually written
  * @throws SystemError on failure
  */
-size_t write(Descriptor fd, std::span<const std::byte> buffer);
+size_t write(Descriptor fd, std::span<const std::byte> buffer, bool allowInterrupts);
 
 /**
  * Get the size of a file.
diff --git a/src/libutil/unix/file-descriptor.cc b/src/libutil/unix/file-descriptor.cc
index 3d1cd1928..05ec38a67 100644
--- a/src/libutil/unix/file-descriptor.cc
+++ b/src/libutil/unix/file-descriptor.cc
@@ -42,11 +42,12 @@ size_t readOffset(Descriptor fd, off_t offset, std::span<std::byte> buffer)
     return static_cast<size_t>(n);
 }
 
-size_t write(Descriptor fd, std::span<const std::byte> buffer)
+size_t write(Descriptor fd, std::span<const std::byte> buffer, bool allowInterrupts)
 {
     ssize_t n;
     do {
-        checkInterrupt();
+        if (allowInterrupts)
+            checkInterrupt();
         n = ::write(fd, buffer.data(), buffer.size());
     } while (n == -1 && errno == EINTR);
     if (n == -1)
diff --git a/src/libutil/windows/file-descriptor.cc b/src/libutil/windows/file-descriptor.cc
index 294dd85f9..2e8d35ed6 100644
--- a/src/libutil/windows/file-descriptor.cc
+++ b/src/libutil/windows/file-descriptor.cc
@@ -60,9 +60,10 @@ size_t readOffset(Descriptor fd, off_t offset, std::span<std::byte> buffer)
     return static_cast<size_t>(n);
 }
 
-size_t write(Descriptor fd, std::span<const std::byte> buffer)
+size_t write(Descriptor fd, std::span<const std::byte> buffer, bool allowInterrupts)
 {
-    checkInterrupt(); // For consistency with unix
+    if (allowInterrupts)
+        checkInterrupt(); // For consistency with unix
     DWORD n;
     if (!WriteFile(fd, buffer.data(), static_cast<DWORD>(buffer.size()), &n, NULL)) {
         auto lastError = GetLastError();