diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index d4a1b05de..6984bdf05 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -2479,9 +2479,9 @@ different subdirectory.
         if 'language' not in kwargs:
             raise InvalidCode('Missing language definition in {}'.format(node.func_name))
 
-        lang = kwargs['language'].lower()
-        args = argsdict.get(lang, []) + args
-        argsdict[lang] = args
+        for lang in mesonlib.stringlistify(kwargs['language']):
+            lang = lang.lower()
+            argsdict[lang] = argsdict.get(lang, []) + args
 
     def func_environment(self, node, args, kwargs):
         return EnvironmentVariablesHolder()
diff --git a/test cases/common/123 subproject project arguments/exe.c b/test cases/common/123 subproject project arguments/exe.c
index b04344adc..d6440f01c 100644
--- a/test cases/common/123 subproject project arguments/exe.c	
+++ b/test cases/common/123 subproject project arguments/exe.c	
@@ -18,6 +18,10 @@
 #error
 #endif
 
+#ifndef PROJECT_OPTION_C_CPP
+#error
+#endif
+
 int main(int argc, char **argv) {
     return 0;
 }
diff --git a/test cases/common/123 subproject project arguments/exe.cpp b/test cases/common/123 subproject project arguments/exe.cpp
index 7ffe098b6..8471c6fec 100644
--- a/test cases/common/123 subproject project arguments/exe.cpp	
+++ b/test cases/common/123 subproject project arguments/exe.cpp	
@@ -18,6 +18,10 @@
 #error
 #endif
 
+#ifndef PROJECT_OPTION_C_CPP
+#error
+#endif
+
 int main(int argc, char **argv) {
     return 0;
 }
diff --git a/test cases/common/123 subproject project arguments/meson.build b/test cases/common/123 subproject project arguments/meson.build
index aee803c0f..12a94972f 100644
--- a/test cases/common/123 subproject project arguments/meson.build	
+++ b/test cases/common/123 subproject project arguments/meson.build	
@@ -6,6 +6,7 @@ add_global_arguments('-DGLOBAL_ARGUMENT', language: 'c')
 add_project_arguments('-DPROJECT_OPTION', language: 'c')
 add_project_arguments('-DPROJECT_OPTION_1', language: 'c')
 add_project_arguments('-DPROJECT_OPTION_CPP', language: 'cpp')
+add_project_arguments('-DPROJECT_OPTION_C_CPP', language: ['c', 'cpp'])
 
 sub = subproject('subexe', version : '1.0.0')
 e = executable('exe', 'exe.c')
diff --git a/test cases/common/123 subproject project arguments/subprojects/subexe/subexe.c b/test cases/common/123 subproject project arguments/subprojects/subexe/subexe.c
index 6ebd752a3..f748afc18 100644
--- a/test cases/common/123 subproject project arguments/subprojects/subexe/subexe.c	
+++ b/test cases/common/123 subproject project arguments/subprojects/subexe/subexe.c	
@@ -6,6 +6,10 @@
 #error
 #endif
 
+#ifdef PROJECT_OPTION_C_CPP
+#error
+#endif
+
 #ifndef GLOBAL_ARGUMENT
 #error
 #endif
diff --git a/test cases/common/23 global arg/meson.build b/test cases/common/23 global arg/meson.build
index aec5c2d80..d7fd4286a 100644
--- a/test cases/common/23 global arg/meson.build	
+++ b/test cases/common/23 global arg/meson.build	
@@ -3,6 +3,8 @@ project('global arg test', 'cpp', 'c')
 add_global_arguments('-DMYTHING', language : 'c')
 add_global_arguments('-DMYCPPTHING', language : 'cpp')
 
+add_global_arguments('-DMYCANDCPPTHING', language: ['c', 'cpp'])
+
 exe1 = executable('prog', 'prog.c')
 exe2 = executable('prog2', 'prog.cc')
 
diff --git a/test cases/common/23 global arg/prog.c b/test cases/common/23 global arg/prog.c
index df9177739..ace5a0a5e 100644
--- a/test cases/common/23 global arg/prog.c	
+++ b/test cases/common/23 global arg/prog.c	
@@ -6,6 +6,10 @@
 #error "Wrong global argument set"
 #endif
 
+#ifndef MYCANDCPPTHING
+#error "Global argument not set"
+#endif
+
 int main(int argc, char **argv) {
     return 0;
 }
diff --git a/test cases/common/23 global arg/prog.cc b/test cases/common/23 global arg/prog.cc
index 342fdd0cb..0ffd85e61 100644
--- a/test cases/common/23 global arg/prog.cc	
+++ b/test cases/common/23 global arg/prog.cc	
@@ -6,6 +6,10 @@
 #error "Global argument not set"
 #endif
 
+#ifndef MYCANDCPPTHING
+#error "Global argument not set"
+#endif
+
 int main(int argc, char **argv) {
     return 0;
 }