diff --git a/c/src/exec/score/cpu/m68k/asm.h b/c/src/exec/score/cpu/m68k/asm.h
index fda93d9528..1f2a647947 100644
--- a/c/src/exec/score/cpu/m68k/asm.h
+++ b/c/src/exec/score/cpu/m68k/asm.h
@@ -30,7 +30,9 @@
  *  Indicate we are in an assembly file and get the basic CPU definitions.
  */
 
+#ifndef ASM
 #define ASM
+#endif
 #include <rtems/score/targopts.h>
 #include <rtems/score/cpu.h>
 
diff --git a/c/src/exec/score/cpu/sparc/asm.h b/c/src/exec/score/cpu/sparc/asm.h
index 22c8365b88..b9a3aabeea 100644
--- a/c/src/exec/score/cpu/sparc/asm.h
+++ b/c/src/exec/score/cpu/sparc/asm.h
@@ -27,7 +27,9 @@
  *  Indicate we are in an assembly file and get the basic CPU definitions.
  */
 
+#ifndef ASM
 #define ASM
+#endif
 
 #include <rtems/score/targopts.h>
 #include <rtems/score/cpu.h>
diff --git a/cpukit/score/cpu/m68k/asm.h b/cpukit/score/cpu/m68k/asm.h
index fda93d9528..1f2a647947 100644
--- a/cpukit/score/cpu/m68k/asm.h
+++ b/cpukit/score/cpu/m68k/asm.h
@@ -30,7 +30,9 @@
  *  Indicate we are in an assembly file and get the basic CPU definitions.
  */
 
+#ifndef ASM
 #define ASM
+#endif
 #include <rtems/score/targopts.h>
 #include <rtems/score/cpu.h>
 
diff --git a/cpukit/score/cpu/m68k/rtems/asm.h b/cpukit/score/cpu/m68k/rtems/asm.h
index fda93d9528..1f2a647947 100644
--- a/cpukit/score/cpu/m68k/rtems/asm.h
+++ b/cpukit/score/cpu/m68k/rtems/asm.h
@@ -30,7 +30,9 @@
  *  Indicate we are in an assembly file and get the basic CPU definitions.
  */
 
+#ifndef ASM
 #define ASM
+#endif
 #include <rtems/score/targopts.h>
 #include <rtems/score/cpu.h>
 
diff --git a/cpukit/score/cpu/sparc/asm.h b/cpukit/score/cpu/sparc/asm.h
index 22c8365b88..b9a3aabeea 100644
--- a/cpukit/score/cpu/sparc/asm.h
+++ b/cpukit/score/cpu/sparc/asm.h
@@ -27,7 +27,9 @@
  *  Indicate we are in an assembly file and get the basic CPU definitions.
  */
 
+#ifndef ASM
 #define ASM
+#endif
 
 #include <rtems/score/targopts.h>
 #include <rtems/score/cpu.h>
diff --git a/cpukit/score/cpu/sparc/rtems/asm.h b/cpukit/score/cpu/sparc/rtems/asm.h
index 22c8365b88..b9a3aabeea 100644
--- a/cpukit/score/cpu/sparc/rtems/asm.h
+++ b/cpukit/score/cpu/sparc/rtems/asm.h
@@ -27,7 +27,9 @@
  *  Indicate we are in an assembly file and get the basic CPU definitions.
  */
 
+#ifndef ASM
 #define ASM
+#endif
 
 #include <rtems/score/targopts.h>
 #include <rtems/score/cpu.h>