diff --git a/src/gallium/auxiliary/gallivm/lp_bld_debug.cpp b/src/gallium/auxiliary/gallivm/lp_bld_debug.cpp
index b685c087370..62825a29b99 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_debug.cpp
+++ b/src/gallium/auxiliary/gallivm/lp_bld_debug.cpp
@@ -25,6 +25,8 @@
  *
  **************************************************************************/
 
+#include <stddef.h>
+
 #include <llvm-c/Core.h>
 #include <llvm/Target/TargetMachine.h>
 #include <llvm/Target/TargetInstrInfo.h>
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
index 85fabc574b2..222241a140a 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
+++ b/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
@@ -34,6 +34,8 @@
 #define __STDC_CONSTANT_MACROS
 #endif
 
+#include <stddef.h>
+
 #include <llvm-c/Core.h>
 #include <llvm-c/ExecutionEngine.h>
 #include <llvm/Target/TargetOptions.h>