diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp
index 5d26456c7..322e9f706 100644
--- a/src/core/arm/interpreter/armemu.cpp
+++ b/src/core/arm/interpreter/armemu.cpp
@@ -6672,10 +6672,10 @@ L_stm_s_takeabort:
                 const u32 rm_val = state->Reg[rm_idx];
                 const u32 rn_val = state->Reg[rn_idx];
 
-                const u8 diff1 = (u8)std::labs((rn_val & 0xFF) - (rm_val & 0xFF));
-                const u8 diff2 = (u8)std::labs(((rn_val >> 8) & 0xFF) - ((rm_val >> 8) & 0xFF));
-                const u8 diff3 = (u8)std::labs(((rn_val >> 16) & 0xFF) - ((rm_val >> 16) & 0xFF));
-                const u8 diff4 = (u8)std::labs(((rn_val >> 24) & 0xFF) - ((rm_val >> 24) & 0xFF));
+                const u8 diff1 = (u8)std::labs( ((s32) (rn_val & 0xFF)) - ((s32) (rm_val & 0xFF)) );
+                const u8 diff2 = (u8)std::labs( ((s32) ((rn_val >>  8) & 0xFF)) - ((s32) ((rm_val >>  8) & 0xFF)) );
+                const u8 diff3 = (u8)std::labs( ((s32) ((rn_val >> 16) & 0xFF)) - ((s32) ((rm_val >> 16) & 0xFF)) );
+                const u8 diff4 = (u8)std::labs( ((s32) ((rn_val >> 24) & 0xFF)) - ((s32) ((rm_val >> 24) & 0xFF)) );
 
                 u32 finalDif = (diff1 + diff2 + diff3 + diff4);