diff --git a/tests/testPotentialPair.c b/tests/testPotentialPair.c
index 171703873d7388b36b96b130b4e54f65476a8511..5092df2d2a2df2d8fc6e1f3c8bbdc4432d604df9 100644
--- a/tests/testPotentialPair.c
+++ b/tests/testPotentialPair.c
@@ -205,6 +205,7 @@ int main(int argc, char *argv[]) {
     gp->id_or_neg_offset = n + 1;
 #ifdef SWIFT_DEBUG_CHECKS
     gp->ti_drift = 8;
+    gp->initialised = 1;
 #endif
   }
 
@@ -222,6 +223,7 @@ int main(int argc, char *argv[]) {
   ci.grav.parts[0].id_or_neg_offset = 1;
 #ifdef SWIFT_DEBUG_CHECKS
   ci.grav.parts[0].ti_drift = 8;
+  ci.grav.parts[0].initialised = 1;
 #endif
 
   /* Now compute the forces */
@@ -378,6 +380,7 @@ int main(int argc, char *argv[]) {
     ci.grav.parts[n].id_or_neg_offset = 1;
 #ifdef SWIFT_DEBUG_CHECKS
     ci.grav.parts[n].ti_drift = 8;
+    ci.grav.parts[n].initialised = 1;
 #endif
   }
 
diff --git a/tests/testPotentialSelf.c b/tests/testPotentialSelf.c
index 83775203cd46bc2b3fece54f7a7f5d1a1725c810..08a0870c61d128b62b8b72f90ecc42317acd895c 100644
--- a/tests/testPotentialSelf.c
+++ b/tests/testPotentialSelf.c
@@ -157,6 +157,7 @@ int main(int argc, char *argv[]) {
   c.grav.parts[0].id_or_neg_offset = 1;
 #ifdef SWIFT_DEBUG_CHECKS
   c.grav.parts[0].ti_drift = 8;
+  c.grav.parts[0].initialised = 1;
 #endif
 
   /* Create the mass-less particles */
@@ -173,6 +174,7 @@ int main(int argc, char *argv[]) {
     gp->id_or_neg_offset = n + 1;
 #ifdef SWIFT_DEBUG_CHECKS
     gp->ti_drift = 8;
+    gp->initialised = 1;
 #endif
   }