diff --git a/exec.c b/exec.c
index bf2d82b..1d94ec1 100644
--- a/exec.c
+++ b/exec.c
@@ -64,6 +64,8 @@
 
 #if defined(TARGET_SPARC64)
 #define TARGET_PHYS_ADDR_SPACE_BITS 41
+#elif defined(TARGET_SPARC)
+#define TARGET_PHYS_ADDR_SPACE_BITS 36
 #elif defined(TARGET_ALPHA)
 #define TARGET_PHYS_ADDR_SPACE_BITS 42
 #define TARGET_VIRT_ADDR_SPACE_BITS 42