diff --git a/src/mesa/shader/slang/slang_compile_variable.c b/src/mesa/shader/slang/slang_compile_variable.c
index b62743addb0..679d93b951a 100644
--- a/src/mesa/shader/slang/slang_compile_variable.c
+++ b/src/mesa/shader/slang/slang_compile_variable.c
@@ -183,7 +183,7 @@ int slang_variable_construct (slang_variable *var)
 	var->initializer = NULL;
 	var->address = ~0;
 	var->size = 0;
-	var->global = 0;
+	var->global = GL_FALSE;
 	return 1;
 }
 
diff --git a/src/mesa/shader/slang/slang_compile_variable.h b/src/mesa/shader/slang/slang_compile_variable.h
index 6b9679a3b75..0b62ad2f1d3 100644
--- a/src/mesa/shader/slang/slang_compile_variable.h
+++ b/src/mesa/shader/slang/slang_compile_variable.h
@@ -76,7 +76,7 @@ typedef struct slang_variable_
 	struct slang_operation_ *initializer;
 	unsigned int address;
 	unsigned int size;
-	int global;
+	GLboolean global;
 } slang_variable;
 
 int slang_variable_construct (slang_variable *);