diff --git a/libs/main/system/piprocess.cpp b/libs/main/system/piprocess.cpp
index c551b48c..a21b6930 100644
--- a/libs/main/system/piprocess.cpp
+++ b/libs/main/system/piprocess.cpp
@@ -212,14 +212,16 @@ PRIVATE_DEFINITION_START(PIProcess)
 #  ifdef WINDOWS
 			DWORD available = 0;
 			PeekNamedPipe(pipes[pipe_type][PipeRead], nullptr, 0, nullptr, &available, nullptr);
-			if (available > 0) {
-				BOOL ok = ReadFile(pipes[pipe_type][PipeRead],
-							  read_buffer.data(offset),
-							  piMini(available, read_buffer.size() - offset),
-							  &bytes_read,
-							  nullptr);
-				if (!ok) bytes_read = 0;
+			if (available == 0) {
+				read_buffer.resize(offset);
+				break;
 			}
+			BOOL ok = ReadFile(pipes[pipe_type][PipeRead],
+						  read_buffer.data(offset),
+						  piMini(available, read_buffer.size() - offset),
+						  &bytes_read,
+						  nullptr);
+			if (!ok) bytes_read = 0;
 #  else
 			bytes_read = ::read(pipes[pipe_type][PipeRead], read_buffer.data(offset), read_buffer.size() - offset);
 #  endif