diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
index b490a801..1e114ca7 100644
--- a/src/libcamera/pipeline/ipu3/ipu3.cpp
+++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
@@ -1532,7 +1532,8 @@ int CIO2Device::allocateBuffers()
 
 void CIO2Device::freeBuffers()
 {
-	availableBuffers_ = {};
+	/* The default std::queue constructor is explicit with gcc 5 and 6. */
+	availableBuffers_ = std::queue<FrameBuffer *>{};
 
 	buffers_.clear();