diff --git a/interface/meson.build b/interface/meson.build
index 826d7ee04..18abcba12 100644
--- a/interface/meson.build
+++ b/interface/meson.build
@@ -1,3 +1,7 @@
+interface_args = ['-include', f'@bldroot@/simd_conf.h']
+if not build_without_cblas
+  interface_args += '-DCBLAS'
+endif
 _blas_roots = [
   # NOTE: q, qx, x, xq do not have cblas_ rules in the Makefile
   # NOTE: https://developer.arm.com/documentation/101004/2310/BLAS-Basic-Linear-Algebra-Subprograms/CBLAS-functions?lang=en
@@ -559,7 +563,7 @@ foreach conf : _blas_roots
         continue
       endif
       # Seed with common args
-      compiler_args = [_cargs]
+      compiler_args = _cargs + interface_args
       # Generate the symbol flags
       base = conf['base']
       if symb_defs.has_key(base)
diff --git a/meson.build b/meson.build
index 065a8b187..b05e06da9 100644
--- a/meson.build
+++ b/meson.build
@@ -178,7 +178,6 @@ configure_file(output : 'simd_conf.h',
                configuration : simd_conf_data)
 # Can't be added as a project argument since it won't be generated until later
 bldroot = meson.build_root()
-_cargs += ['-include', f'@bldroot@/simd_conf.h']
 add_project_arguments(simd_cargs, language: 'c')
 
 # Common symbol related options
@@ -199,9 +198,6 @@ foreach symb : symnames
   _cargs += f'-U@symb@'
 endforeach
 # Based on options
-if not build_without_cblas
-  _cargs += '-DCBLAS'
-endif
 if no_affinity
   _cargs += '-DNO_AFFINITY'
 endif