diff --git a/arch/posix/include/offsets_short_arch.h b/arch/posix/include/offsets_short_arch.h
index 50295be..9d5e415 100644
--- a/arch/posix/include/offsets_short_arch.h
+++ b/arch/posix/include/offsets_short_arch.h
@@ -24,9 +24,6 @@
 #define _thread_offset_to_esp \
 	(___thread_t_callee_saved_OFFSET + ___callee_saved_t_esp_OFFSET)
 
-#define _thread_offset_to_coopFloatReg \
-	(___thread_t_arch_OFFSET + ___thread_arch_t_coopFloatReg_OFFSET)
-
 #define _thread_offset_to_preempFloatReg \
 	(___thread_t_arch_OFFSET + ___thread_arch_t_preempFloatReg_OFFSET)
 
diff --git a/arch/x86/core/offsets/offsets.c b/arch/x86/core/offsets/offsets.c
index f37f10d..f03b5d3 100644
--- a/arch/x86/core/offsets/offsets.c
+++ b/arch/x86/core/offsets/offsets.c
@@ -36,7 +36,6 @@
 GEN_OFFSET_SYM(_thread_arch_t, excNestCount);
 #endif
 
-GEN_OFFSET_SYM(_thread_arch_t, coopFloatReg);
 GEN_OFFSET_SYM(_thread_arch_t, preempFloatReg);
 
 /**
@@ -45,8 +44,7 @@
  */
 
 GEN_ABSOLUTE_SYM(_K_THREAD_NO_FLOAT_SIZEOF,
-		 sizeof(struct k_thread) - sizeof(tCoopFloatReg) -
-			 sizeof(tPreempFloatReg));
+		 sizeof(struct k_thread) - sizeof(tPreempFloatReg));
 
 GEN_OFFSET_SYM(_callee_saved_t, esp);
 
diff --git a/arch/x86/include/kernel_arch_thread.h b/arch/x86/include/kernel_arch_thread.h
index 766a9f8..6603594 100644
--- a/arch/x86/include/kernel_arch_thread.h
+++ b/arch/x86/include/kernel_arch_thread.h
@@ -200,22 +200,6 @@
 #endif /* CONFIG_LAZY_FP_SHARING || CONFIG_EAGER_FP_SHARING */
 
 /*
- * The following structure defines the set of 'non-volatile' x87 FPU/MMX/SSE
- * registers. These registers must be preserved by a called C function.
- * These are the only registers that need to be saved/restored when a
- * cooperative context switch occurs.
- */
-
-typedef struct s_coopFloatReg {
-
-	/*
-	 * This structure intentionally left blank, i.e. the ST[0] -> ST[7] and
-	 * XMM0 -> XMM7 registers are all 'volatile'.
-	 */
-
-} tCoopFloatReg;
-
-/*
  * The following structure defines the set of 'volatile' x87 FPU/MMX/SSE
  * registers.  These registers need not be preserved by a called C function.
  * Given that they are not preserved across function calls, they must be
@@ -260,11 +244,9 @@
 	 * Given that stacks "grow down" on IA-32, and the TCS is located
 	 * at the start of a thread's "workspace" memory, the stacks of
 	 * threads that do not utilize floating point instruction can
-	 * effectively consume the memory occupied by the 'tCoopFloatReg' and
-	 * 'tPreempFloatReg' structures without ill effect.
+	 * effectively consume the memory occupied by the 'tPreempFloatReg'
+	 * struct without ill effect.
 	 */
-
-	tCoopFloatReg coopFloatReg; /* non-volatile float register storage */
 	tPreempFloatReg preempFloatReg; /* volatile float register storage */
 };
 
diff --git a/arch/x86/include/offsets_short_arch.h b/arch/x86/include/offsets_short_arch.h
index 980fc9e..180d12d 100644
--- a/arch/x86/include/offsets_short_arch.h
+++ b/arch/x86/include/offsets_short_arch.h
@@ -24,9 +24,6 @@
 #define _thread_offset_to_esp \
 	(___thread_t_callee_saved_OFFSET + ___callee_saved_t_esp_OFFSET)
 
-#define _thread_offset_to_coopFloatReg \
-	(___thread_t_arch_OFFSET + ___thread_arch_t_coopFloatReg_OFFSET)
-
 #define _thread_offset_to_preempFloatReg \
 	(___thread_t_arch_OFFSET + ___thread_arch_t_preempFloatReg_OFFSET)
 
diff --git a/subsys/debug/openocd.c b/subsys/debug/openocd.c
index a80e4a9..ee3f89e 100644
--- a/subsys/debug/openocd.c
+++ b/subsys/debug/openocd.c
@@ -77,8 +77,7 @@
 #elif defined(CONFIG_FLOAT) && defined(CONFIG_X86)
 	[OPENOCD_OFFSET_T_PREEMPT_FLOAT] = offsetof(struct _thread_arch,
 						    preempFloatReg),
-	[OPENOCD_OFFSET_T_COOP_FLOAT] = offsetof(struct _thread_arch,
-						 coopFloatReg),
+	[OPENOCD_OFFSET_T_COOP_FLOAT] = OPENOCD_UNIMPLEMENTED,
 #else
 	[OPENOCD_OFFSET_T_PREEMPT_FLOAT] = OPENOCD_UNIMPLEMENTED,
 	[OPENOCD_OFFSET_T_COOP_FLOAT] = OPENOCD_UNIMPLEMENTED,