diff --git a/cmake/compiler/gcc/target_riscv.cmake b/cmake/compiler/gcc/target_riscv.cmake
index 95ef3f63c9f..4e83f5d187b 100644
--- a/cmake/compiler/gcc/target_riscv.cmake
+++ b/cmake/compiler/gcc/target_riscv.cmake
@@ -81,7 +81,9 @@ if(CONFIG_RISCV_ISA_EXT_ZBS)
     string(CONCAT riscv_march ${riscv_march} "_zbs")
 endif()
 
-if(CONFIG_RISCV_ISA_EXT_ZMMUL AND
+# Check whether we already imply Zmmul by selecting the M extension; if not - enable it
+if(NOT CONFIG_RISCV_ISA_EXT_M AND
+   CONFIG_RISCV_ISA_EXT_ZMMUL AND
    "${GCC_COMPILER_VERSION}" VERSION_GREATER_EQUAL 13.0.0)
     string(CONCAT riscv_march ${riscv_march} "_zmmul")
 endif()